Sunday, March 31, 2019
April Fooling: 2019 Edition
Eve Armstrong has posted a fake paper on arXiv. (While I am sometimes amused by the April Fool's Day papers that appear on the arXiv, what I don't understand is how some of them get to go on the arXiv, while a few of my real papers have actually been rejected from the arXiv.)
Theresa May looks set to become the next Cambridge vice-chancellor after stepping down as Prime Minister. (Tip of the cap to Carola-Bibiane Schönlieb.)
Here is a summary of some of today's pranks. I like the new depicted 50-pence coin. :) The bottom of the article includes a gallery of famous hoaxes (including some great ones), but sadly they missed out on Sidd Finch.
A Two-Sentence Paper in Physical Review
The shocking discovery of the shortest article ever published in Physical Review (1951), a serious physics journal. Two sentences. Moreover, the article relates 6*pi^5 to the ultimate structure of physical reality. pic.twitter.com/Gs1ERmLjXu
— Cliff Pickover (@pickover) March 31, 2019
Tuesday, March 26, 2019
Visual Illusion: Starry Night Edition
Stare at the white dot for 10 seconds, then look at Van Gogh's Starry Night below. pic.twitter.com/GDECuOrdau
— Universal-Sci (@universal_sci) March 27, 2019
What Happens in Lake Arrowhead Stays in Lake Arrowhead
Causality, patterns and prediction" workshop. I can DANCE if I want to. (I can leave my friends behind.)
Thursday, March 21, 2019
A Mathematical 'Table of Ease' from 1557
From Recorde's 'The Whetstone of Witte' (1557). "The fruitful table, which may be called the table of ease".
— Jo Morgan (@mathsjem) March 21, 2019
There are some awesome words in this table. Check out number 16. And 'squares of cubicubes'. pic.twitter.com/mhGOTD0LFB
Wednesday, March 20, 2019
Matrices of Chocolates (and Delicious Missing Data)
A rectangular Hankel chocolate box. You need O( log( m + n ) ) time to eat it. pic.twitter.com/jkhYQSb9mT
— Daniel Kressner (@_kreda_) March 20, 2019
Saturday, March 16, 2019
What Happens in Tarrogona Stays in Tarragona (2019 Edition)
My assigned duties at the conference are threehold:
(1) give the first invited talk;
(2) chair one of the sessions;
(3) and help keep track of which talk first uses the Karate Club network (because the Karate Trophy will be present, and the person who holds it can't attend all of the talks because of conference organizing duties)
Thursday, March 14, 2019
Customizable Ducks in \Latex
There is a latex package to get all sorts of fancy duck emoji in latex: https://t.co/T0Ah9MsquA pic.twitter.com/dmmstJkfH5
— DynamicalSystemsSIAM (@DynamicsSIAM) March 14, 2019
Emoji and \Latex: Bowser, Peach, Mario, and the Dynamics of Love
Today I was figuring out how to successfully put emoji into equations in \latex (I'll have a cool example in my talk at @CompleNet on Monday), so I decided to take @stevenstrogatz's "dynamics of love affairs" example and make it Mario-themed.
— Mason Porter (@masonporter) March 14, 2019
See also: https://t.co/7AlMv4fDdj pic.twitter.com/3sVVAhAYSI
Update: I should have zoomed in more to show a higher-quality screenshot. Here is one, where you can see that the graphics are rather clear.
Monday, March 11, 2019
Snarky Network-Science Venn Diagram: Version 1.0
I'm sure that this one too can be improved. (I think this one needs more significant improvement than my mathematics one.)
Update (3/12/19): Franklin Kenter pointed out correctly to me that a four-set Venn diagram requires three dimensions, so let's say that what I drew is a "Venn-like" diagram, given that I am missing some of the intersections. (My positioning of the different sets was one that gave me the intersections that I wanted.)
Snarky Mathematics Venn Diagram: Version 1.01
I'm sure that it can be improved.
(I was, of course, inspired partly by this Venn diagram.)
Update: One of my friends caught a grammatical error, so I fixed it for Version 1.01. That is the only difference between Versions 1.0 and 1.01.
Update (3/12/19): Franklin Kenter pointed out correctly to me that a four-set Venn diagram requires three dimensions, so let's say that what I drew is a "Venn-like" diagram, given that I am missing some of the intersections. (My positioning of the different sets was one that gave me the intersections that I wanted.)
Sunday, March 10, 2019
Life Imitates Jurassic Park
Your scientists were so preoccupied with whether or not they could, they didn't stop to think if they should... https://t.co/oBKYZ9Ilsh
— Jeff Goldblum (@jeffreygoldbIum) March 9, 2019
(Tip of the cap to Richard Prather.)
Friday, March 08, 2019
Academic Paper on Evil Laughter
(Also, Evil will always triumph, because Good is dumb!)
Wednesday, March 06, 2019
Dystopian Lego Art
If anyone asks you if dystopian LEGO art exists, the answer is yes
— Scott Kerr (@scott_kerr) March 6, 2019
by Filip Hodas pic.twitter.com/0EqUbj87xx
Monday, March 04, 2019
Beautiful Geometric Art by Saskia Freeke
Go and check out her work!
Geometric Shapes / 190304#processing #creativecoding pic.twitter.com/Wru3fMRHUq
— Saskia Freeke (@sasj_nl) March 4, 2019
Sunday, March 03, 2019
What Could Possibly Go Wrong (1840s Edition)
Also, look at the follow-up tweet in response.
(What could possibly go wrong? 1840s edition)
Alas, I have no idea how this romantic gesture worked out for him. (Oxford Chronicle 1841, via @_newspapers) pic.twitter.com/neklN6DmhH
— Undine (@HorribleSanity) March 3, 2019
(Tip of the cap to Sydney Padua.)
Ancient Doodles Around the World
Oh wait...
Mysterious ancient symbols found throughout the world. Source: https://t.co/vzCu3a0mYC pic.twitter.com/gJ7bJku9c2
— Cliff Pickover (@pickover) March 3, 2019
(Tip of the cap to math prof.)
Friday, March 01, 2019
Dividing By Zero on a Mechanical Calculator
Divide by zero on an old mechanical calculator!https://t.co/AALw5IRyYP
— Michael Fogleman (@FogleBird) March 1, 2019
(The Pet Shop Boys would be proud.)
Highlighting Lead Junior Scientists in SIMODS
Course Nomenclature in our Imminent Data Theory Major
The UCLA mathematics department has a course called "Math 142: Mathematical Modeling", and my new lower-division mathematical-modeling course for our new Data Theory major was thus given the label "Math 42".
— Mason Porter (@masonporter) March 1, 2019
Given such an opportunity, I needed an appropriate name for the course. pic.twitter.com/mUGK1th012
Thursday, February 28, 2019
A Robot Powered by "Advanced Machine Learning"
When people say 'we use #machinelearning in the business process.'
— Selin Cetin (@robolegist) February 28, 2019
Sometimes...I know that...🙄 pic.twitter.com/2XQSO5jsod
Wednesday, February 27, 2019
New XKCD: "Differentiation and Integration"
My favorite step of integration is "burn the evidence". ;)
Tuesday, February 26, 2019
The Tennessee Woman Suffrage Memorial
A nice thing to do in Knoxville (say, during a visit to @NIMBioS) is to go to Market Square and take a look at the Tennessee Woman Suffrage Memorial.
— Mason Porter (@masonporter) February 26, 2019
Here is a short video, with a full view of the Memorial's historical text: https://t.co/EeWV57Jncyhttps://t.co/UShnfB3Px0
"Hipsters on Networks: How a Minority Group of Individuals Can Lead to an Antiestablishment Majority"
Title Hipsters on Networks: How a Minority Group of Individuals Can Lead to an Antiestablishment Majority
Authors Jonas J. Juul and Mason A. Porter
Abstract: The spread of opinions, memes, diseases, and “alternative facts” in a population depends both on the details of the spreading process and on the structure of the social and communication networks on which they spread. One feature that can change spreading dynamics substantially is heterogeneous behavior among different types of individuals in a social network. In this paper, we explore how antiestablishment nodes (e.g., hipsters) influence the spreading dynamics of two competing products.We consider a model in which spreading follows a deterministic rule for updating node states (which indicate which product has been adopted) in which an adjustable probability $p_{Hip}$ of the nodes in a network are hipsters, who choose to adopt the product that they believe is the less popular of the two. The remaining nodes are conformists, who choose which product to adopt by considering which products their immediate neighbors have adopted. We simulate our model on both synthetic and real networks, and we show that the hipsters have a major effect on the final fraction of people who adopt each product: even when only one of the two products exists at the beginning of the simulations, a small fraction of hipsters in a network can still cause the other product to eventually become the more popular one. To account for this behavior, we construct an approximation for the steady-state adoption fractions of the products on \emph{k}-regular trees in the limit of few hipsters. Additionally, our simulations demonstrate that a time delay τ in the knowledge of the product distribution in a population, as compared to immediate knowledge of product adoption among nearest neighbors, can have a large effect on the final distribution of product adoptions. Using a local-tree approximation, we derive an analytical estimate of the spreading of products and obtain good agreement if a sufficiently small fraction of the population consists of hipsters. In all networks, we find that either of the two products can become the more popular one at steady state, depending on the fraction of hipsters in the network and on the amount of delay in the knowledge of the product distribution. Our simple model and analysis may help shed light on the road to success for antiestablishment choices in elections, as such success—and qualitative differences in final outcomes between competing products, political candidates, and so on—can arise rather generically in our model from a small number of antiestablishment individuals and ordinary processes of social influence on normal individuals.
Note: As we write in the paper, "The original hipster was in the network before it was popular."
Sunday, February 24, 2019
What Happens in Knoxville Stays in Knoxville
Saturday, February 23, 2019
A Novel-Writing Algorithm
😅 @tomgauld and the novel writing algorithm 📚💻 pic.twitter.com/5WTk6XxTXt
— Dr Jess Wade 👩🏻🔬 (@jesswade) February 23, 2019
Friday, February 22, 2019
"On Brand" Story from Childhood
A Topps baseball card had a batting average that was inconsistent with a player's hit and at-bat totals, so I typed (with a typewriter) and snail-mailed a letter to Topps to inform them that their calculation, their data, or both were wrong. I also asked them what the error was. https://t.co/u3KPrC5YSq
— Mason Porter (@masonporter) February 23, 2019
(They answered me. Apparently, the batting average was correct, but the data were entered incorrectly.)
Tales from the ArXiv: Speech-Balloon Detection in Comic Books
Finally, an important paper.
Choice quote from the abstract: "Qualitative results suggest that wiggly tails, curved corners, and even illusory contours do not pose a major problem."
Thursday, February 21, 2019
Headline: "Bowser to Take Over Nintendo’s U.S. Division"
Tuesday, February 19, 2019
Gandalf's Quote About Social Media
"He hated it and loved it, as he hated and loved himself.
— Ethics in Bricks (@EthicsInBricks) February 19, 2019
He could not get rid of it. He had no will left in the matter."
- Gandalf (about social media) pic.twitter.com/aa5nmg2iNx
Monday, February 18, 2019
Impending Elimination of Ohio?
Welp, it had a good run. pic.twitter.com/BdWfByZlhM
— Scott Kerr (@scott_kerr) February 18, 2019
Sunday, February 17, 2019
Heinlein's Checklist for Answering Mail
I particularly like that there is a box labeled "Please do not write to me again."
(Tip of the cap to Giuseppe Paleologo, who was responding to Steve Strogatz.)
My Attempt to Save the World
The Machines, powered by Artificial Intelligence, have taken over! And massive computations are all giving physically implausible solutions!
— Mason Porter (@masonporter) February 17, 2019
We need mathematical models—especially complicated ones with networks and nonlinear systems—to save humanity!
Oh wait... this is real. https://t.co/DljKjpaKSb
Principal Mason Says: The Homework Sword Fight is On!
In fact, if I were a Principal Mason — in addition to the principal Mason, which is true in my own life, at least — I would definitely do this, now that I have seen this excellent idea.
(Tip of the cap to Helen Brown Nazzaro)
Saturday, February 16, 2019
A Clever Way to Increase my h-index
So if I violate this, I can improve my h-index...?
— Mason Porter (@masonporter) February 16, 2019
Hmmm... pic.twitter.com/YF3mGriXql
Friday, February 15, 2019
Topological Data Analysis of Geographic Distance to Donuts
Often from a single position you could see two @dunkindonuts #redditDataIsBeautiful pic.twitter.com/SDfHVXmKub
— Suzanne Sindi (@SuzanneSindi) February 16, 2019
My Academic Valentine
Roses are red.
— Mason Porter (@masonporter) February 14, 2019
The nodes have heterogeneous degrees.
The network may be heavy-tailed;
but it's probably not scale-free.#ScienceValentine#AcademicValentine
(Technically, "The network's degree distribution may be heavy-tailed;", but that's less poetic.)
Thursday, February 14, 2019
Wednesday, February 13, 2019
"I'm in the Best Academic Shape of My Life"
Tuesday, February 12, 2019
Tales from the ArXiv: Was the AI Eaten by a Grue?
(In my quick glance, I noticed a couple of slightly misleading statements about Infocom and their text-adventure games. For example, one figure implicitly seems to suggest that Trinity came out in the early 1980s, but it actually came out in 1986. I know, I know: I am being very picky.)
I hope that they didn't get eaten by a grue.
Or, given that I mentioned Trinity, maybe they reached into the beehive for a third time?
A Great Thread on Questions to Ask When Visiting Possible Graduate-School Destinations
Similar ideas apply when considering where to do a postdoc.
It's grad school visit season. You have a ~20 min meeting with someone, and you're considering devoting 5+ years of your life to working for/with them. Are they a great mentor? Or a toxic tormentor? Here's what questions to ask... /1
— Double Shelix (@doubleshelixpod) February 11, 2019
(Tip of the cap to Suzanne Sindi.)
Saturday, February 09, 2019
An Illustrated Guide from the 1950s for Using Telephones
"When using the telephone, hold the receiver close to your ear. The receiver is the end without the cord." pic.twitter.com/zvciBAZdg7
— Scott Kerr (@scott_kerr) February 9, 2019
Monday, February 04, 2019
"The Use of Multilayer Network Analysis in Animal Behaviour"
Title: The Use of Multilayer Network Analysis in Animal Behaviour
Authors: Kelly R. Finn, Matthew J. Silk, Mason A. Porter, and Noa Pinter-Wollman
Abstract: Network analysis has driven key developments in research on animal behaviour by providing quantitative methods to study the social structures of animal groups and populations. A recent formalism, known as multilayer network analysis, has advanced the study of multifaceted networked systems in many disciplines. It offers novel ways to study and quantify animal behaviour through connected ‘layers’ of interactions. In this article, we review common questions in animal behaviour that can be studied using a multilayer approach, and we link these questions to specific analyses. We outline the types of behavioural data and questions that may be suitable to study using multilayer network analysis. We detail several multilayer methods, which can provide new insights into questions about animal sociality at individual, group, population and evolutionary levels of organization. We give examples for how to implement multilayer methods to demonstrate how taking a multilayer approach can alter inferences about social structure and the positions of individuals within such a structure. Finally, we discuss caveats to undertaking multilayer network analysis in the study of animal social networks, and we call attention to methodological challenges for the application of these approaches. Our aim is to instigate the study of new questions about animal sociality using the new toolbox of multilayer network analysis.
P.S. There is an easter egg in the paper. Let me know when you find it!
Tuesday, January 22, 2019
Mariano Rivera, Edgar Martinez, Roy Halladay, and Mike Mussina Elected to Major League Baseball's Hall of Fame!
This awesome foursome — and I am very pleased about all four of these elections — join Lee Smith and (sigh) Harold Baines, who were elected by the Today's Game Era Committee last month. Rivera, in his first year of eligibility, is the first ever unanimous selection, although there are other luminaries who should already have gotten this distinction years ago. Sadly, the late Roy Halladay (who died tragically in a 2017 plane crash) isn't around to enjoy his election in his first year of eligibility. I thought it might take him a bit of time to get in, and I'm pleased to see Halladay sail into the Hall in his first year. It's sad that he isn't around to enjoy it. :( (By the way, Roy Halladay once wore one of the best costumes ever; he dressed up as Jamie Moyer for an 80s-themed party.) Martinez (in his final year of eligibility) and Mussina finally made it this year, though both of them should have been elected years ago. They are clear-cut Hall of Famers. Pitchers like Mussina are held to ridiculous standards because they didn't win 300 games, and that's just not a realistic level at which to gauge which starters are Hall of Famers and which are not. Mussina was a great pitcher.
For the past several years, I have really enjoyed followed the Hall of Fame tracker as the writers announce their votes.
I'll comment a bit on many (though not all) other players on the 2019 ballot, but to give context, it's worth discussing which new candidates will enter in the 2020 Hall of Fame ballot. The only huge name entering in 2020 is Derek Jeter, who could very well become the second unanimous Hall selection. (Jeter will be close to unanimous, at the very minimum.) There are some other really good players in the 2020 ballot, but I'm not sure if any of them are Hall of Famers. Jason Giambi and the perpetually underrated Bobby Abreu will get some votes, but I don't think that even they will get that many votes. The only newcomer to the ballot with any shot at all — and he is a lock, of course — is Derek Jeter. That gives plenty of scope for remaining candidates to make major increases, which will probably be significantly larger than in a normal year.
The highest voting percentage among those who did not get elected to the Hall is Curt Schilling, who was named on 60.9% of the ballot. With Mussina and Halladay both now in the Hall and no serious candidates among new starting pitchers, I expect Schilling to finally (and belatedly) make it in 2020, as long as he keeps his mouth shut.
Roger Clemens (59.5%) and Barry Bonds (59.1%) kept inching forward, and I'm sure they'll make a bit more progress next year, but they're not still on the ballot because of their performance on the field. I see no reason to think that they'll do anything other than continuing to inch forward.
Larry Walker got 54.6% of the vote in a huge gain, after gaining many votes between 2017 and 2018. Next year is Walker's last one on the ballot, which often results in large gains with one's last chance to think about a player in the regular voting, so I expect that he will follow in Alan Trammell's and Fred McGriff's footsteps and get huge gains again next year. Include the fact that Harold Baines (sigh) is now in the Hall of Fame and that Jeter is the only stellar new candidate in 2020, and I think that Larry Walker will gain hugely in votes again in 2020 and that it will be enough to get elected to the Hall of Fame. Larry Walker was an awesome player and deserves it. Prepare for a lot of discussions about Coors Field in the upcoming year. :)
Omar Vizquel (42.8%) gained a decent number of votes this year, though others were less optimistic about the signs for Vizquel. Vizquel belongs in the Hall of the Very Good — I give thanks to Jim Kaat for inventing that term in reference to himself — and also in the Hall of the Amazing, but he's not a Hall of Famer. Vizquel is destined to become the new Jack Morris (sigh) when it comes to Hall of Fame debates.
Fred McGriff (39.8%), like Alan Trammell previously, received a major boost in his final year on the writers' Hall of Fame ballot. I expect that he'll be selected relatively soon by the Today's Game Committee, likely when it next meets in 2021.
Manny Ramirez (22.8%) stayed level and Jeff Kent (18.1%) gained a little bit, but not much. Jeff Kent is destined for some veterans' committee's vote some years down the line. Scott Rolen (17.2%) gained a decent amount in his second year of eligibility, and I expect him to gain solidly in 2020 as well, possible even enough to get close to 30% of the vote. Billy Wagner (16.7%), in his fourth year of eligibility, gained a little bit. Wagner deserves to be in the Hall of Fame, and I hope the selection of Lee Smith and the lack of realistic new pitcher candidates in 2020 helps him. I suspect that Wagner will become one of the next ones that sabermetricians try to champion, although I think the best move for the next year is concentrating on Larry Walker's candidacy. Todd Helton (16.5%) deserves more votes and may be a Hall of Famer — I think he belongs on the Hall — and I expect him to make major gains next year. Andruw Jones (7.5%) keeps lingering on the ballot — once again finishing slightly above the 5% cutoff to be removed from the ballot — and he deserves much better than this. Jones's career petered out quickly, and people seem to have forgotten just how good a player he was. I don't think he actually belongs in the Hall of Fame, but I'd like to see him get more consideration than this. Among the players who fell off the ballot, Lance Berkman (1.2%) deserved much more consideration for the Hall than he got.
In the 2020 ballot, I predict that Derek Jeter (obviously), Curt Schilling, and Larry Walker make the Hall of Fame. I am least confident about the prediction about Walker, who may end up just falling shy. The fact that there are so few new stellar candidates and that the ballot has cleared up considerably (McGriff is also no longer on the ballot) will help many players make major gains in voting, likely including enough of them for both Curt Schilling and Larry Walker to get elected.
Update (1/26/19) Here are some lessons learned (according to Jay Jaffe) from the balloting results. One of the things that I noticed in this article, which I hadn't noticed earlier this week (but presumably did at some point in the past), is that the players who are debuting in 2021 are also weak overall. Therefore, there are two years for players who are currently on the ballot to make major gains. Jaffe wrote more details in this article.
Saturday, January 19, 2019
What Happens in San José Stays in San José (2019 Edition)
Tuesday, January 15, 2019
"Money" Laundering: Doing it the Literal Way
Their Gaussian curvatures got transformed a bit, but overall they're doing alright.
Sometimes, I am such a theorist.
Note: I suggest responding with your best money-laundering joke.
Additional note: My debit card still has its glossy sheen, but the ID card's surface isn't quite as smooth as it used to be.
The Cult of Pure Mathematics
"Our CVs won’t list the prestigious journals in which we have published, but rather our reputations will be the rumors of our arcane wisdom."
— Anna Haensch (@extremefriday) January 15, 2019
It's the cult I've always wanted!https://t.co/vkZelVoWqM
One choice excerpt (of many) from the article:
Within the sphere of pure mathematics — the oldest and most successful of humanity’s intellectual endeavors — I believe our best chance at preserving the integrity and dignity of our tradition is to return to our Pythagorean roots. We should become a cult.
Let us do away with the job market and mathjobs.com and reference letters. Let us stop pretending we understand each other’s respective sub-fields. Let us abandon those fuck-ugly Brutalist travesties we call our department buildings and leave them to those shills in applied math.
(Tip of the cap to Adriana Salerno.)
Friday, January 11, 2019
RIP Richard Haberman (1945–2018)
RIP Rich Haberman (1945 – 12/31/2018).
— Mason Porter (@masonporter) January 11, 2019
I knew Rich and interacted with him at the Snowbird meetings (and he later hosted me for my job interview at SMU), but I used his PDE book in one of my classes before then.
He was an "unapologetic champion of Applied Mathematics". pic.twitter.com/JmCXkWqsAt
I'd also like to quote the obituary (written by Alejandro Aceves, Roy Goodman, and Peter Miller) in the e-mail that was sent to SIAM's dynamical-systems mailing list:
We are very sad to have to report that Richard Haberman passed away on December 31, 2018. Richard (Rich) received his BS (1967) and PhD (1971) at MIT. During his time as a graduate student, he met Mark Ablowitz, both of whom had the same advisor David Benney. Rich and Mark established a strong friendship that lasted until Rich's passing. They also co-authored papers which mark the start of Rich's contributions to nonlinear waves. In line with the times they worked on ways to generate isospectral flows which are equivalent to systems of nonlinear partial differential equations, including extensions to two and three dimensions, where as we know there are fewer known integrable models. The role of linear and nonlinear resonances leading to 'universal' evolution equations is best seen in their 1975 Journal of Mathematical Physics paper 'Resonantly coupled nonlinear evolution equations'. It is perhaps this aspect that points to the ease in which Rich's work blends nonlinear waves and dynamical systems in a natural way. More recent work with one of us (Roy Goodman) focused on explaining the two-bounce resonance phenomenon and chaotic scattering in the interaction of solitary waves in near-integrable and nonintegrable systems, which again blends nonlinear waves and dynamical systems.
Rich spent the bulk of his career at Southern Methodist University (SMU). An unapologetic champion of Applied Mathematics, he helped shape the Department of Mathematics to put emphasis in this direction. Throughout his almost 40 years as SMU, he mentored many young faculty, undergraduates, and graduate students. One of us (Peter Miller) was lucky to have been a beneficiary of this mentorship of undergraduates at SMU in the 1980's, and feels especially indebted to Rich for his training in applied mathematics and nonlinear waves in particular and his suggestion and support to continue study in graduate school. At the 2007 ICIAM meeting, he recruited one of us (Alejandro Aceves) to join SMU.
Rich's passion to teach the discipline with an applied flavor is best reflected in his books, most notably his book Elementary Applied Partial Differential Equations which has a world-wide audience and has been translated in many languages. This book is famous for its no-nonsense approach to a difficult subject and its clarity of presentation. Rich served for many years as Editor in Chief for the SIAM book series Mathematical Modeling and Computation. His last unfinished project with one of us (Alejandro Aceves) was to write a textbook in nonlinear dynamics based on many iterations of notes he had produced through the years.
Rich is survived by his wife of 50 years Liz Haberman, his children Ken and Vicki, and his granddaughters Leila, Gwyneth and Chloe. He was dedicated to his family and the profession. He was a friend, scientist, mentor and educator who will be sorely missed. The SMU Department of Mathematics is planning the creation of a scholarship in his name and more information about it will be posted on the Department website.
Wednesday, January 09, 2019
A Funky Visual Illusion: What's the Frequency?
You can only see this optical illusion if you shake your head (I’m serious) 😂 pic.twitter.com/WhtZ1b0r4t
— Dr Michelle Dickinson (@medickinson) January 10, 2019
(Tip of the cap to Jenna Walrath.)
Tuesday, January 08, 2019
It's Good to Have a Clew (and a Clew)
The word CLUE derives from ‘clew’, an Old English word for a ball of string. It came to mean ‘a hint that aids a solution’ through allusion to the Greek legend of Theseus, who used Ariadne’s ball of thread to find his way back out of the Labyrinth after killing the Minotaur. pic.twitter.com/LrrzAKtEDk
— Haggard Hawks 📚🦅 (@HaggardHawks) January 7, 2019
Monday, December 31, 2018
Scales in the Universe
It reminds me of the 1977 video called Powers of Ten (of which there are also modern versions), except with new stuff that we now know!
(Tip of the cap to Sara Solla.)
Saturday, December 29, 2018
Pondering Social Contagions in the 19th Century
The winner of Answers magazine's big Question Competition of 1888 was Mr. E Bond of Bloomsbury, who submitted this entry: pic.twitter.com/0kU0Mwxlqj
— Dr Bob Nicholson (@DigiVictorian) December 28, 2018
And here is the beginning of the thread.
In 1888, Answers magazine ran a prize competition in which readers were challenged to send in 'The Most Interesting Question On Any Subject.' Reading through the results is like looking at Victorian Britain's Google search history...
— Dr Bob Nicholson (@DigiVictorian) December 28, 2018
Thread 👇👇👇: pic.twitter.com/Z4aQDTtM3E
Thursday, December 27, 2018
The Final Polishing Step Before Submitting a Manuscript or a Grant Proposal
In the new year, don't forget about this final, very important step when doing the final polishing of your manuscripts and grant proposals just before you submit them. :P
— Mason Porter (@masonporter) December 27, 2018
[Note: I clipped this comic years ago from LA Weekly. It fits academia like a clever but frustrating glove.] pic.twitter.com/K2ncYEatya
Friday, December 21, 2018
A Paper that Rejects Itself
Amazing. Train a network to classify papers (accept/reject). Then run the network on the paper describing the network, and it classifies the paper as a strong reject. This is why we can't have nice paper classifiers. (h/t @hardmaru) https://t.co/OC2baCI1Za pic.twitter.com/3N9wsKQ374
— Chethan Pandarinath (@chethan) December 21, 2018
(Tip of the cap to Karen Daniels.)
Thursday, December 20, 2018
Real-Life Binary Trees!
Here is picture proof that (reasonably) balanced binary trees exist in real life!
— Mason Porter (@masonporter) December 21, 2018
[I took this picture about a decade ago in front of @peetscoffee a few blocks from @Caltech.] pic.twitter.com/iwxfYtVSV4
Wednesday, December 19, 2018
Tales from the ArXiv: Motto: "Somebody has to Study this Shit!"
And I mean this literally: the title of the paper is "An Agent-Based Model for Bovine Viral Diarrhea".
Update: Normally, I hate it when papers are full of bullshit. However, I may need to make an exception in this case.
Tuesday, December 18, 2018
Self-Awareness and the Elephant in the Room
Elephants failed the mirror test for self-awareness — until researchers made the mirrors big enough for elephants to see themselves alongside other elephants.https://t.co/GnI2Z1hsi7 pic.twitter.com/SA5oRE65NU
— Quanta Magazine (@QuantaMagazine) December 18, 2018
(Tip of the cap to Steve Strogatz.)
Friday, December 14, 2018
But Are These Data Cookies Reproducible?
(Tasty, tasty reproducibility.)
Last day of class tomorrow! I baked cookies for my Intro to Data Analytics students, with frosted data plots. Lucky them. #DAatDU pic.twitter.com/j3TCNeDOBe
— Dr. Sarah Supp (@srsupp) December 14, 2018
(Tip of the cap to Javier Buldú.)
Update: Now that I think of it, "Sweet, sweet reproducibility." would have been better phrasing, given its larger set of allusions.
Wednesday, December 12, 2018
"Variability in Fermi–Pasta–Ulam–Tsingou Arrays Can Prevent Recurrences"
Title: "Variability in Fermi–Pasta–Ulam–Tsingou Arrays Can Prevent Recurrences"
Authors: Heather Nelson, Mason A. Porter, and Bhaskar Choubey
Abstract: In 1955, Fermi, Pasta, Ulam, and Tsingou reported recurrence over time of energy between modes in a one-dimensional array of nonlinear oscillators. Subsequently, there have been myriad numerical experiments using homogenous FPUT arrays in the form of chains of ideal, nonlinearly coupled oscillators. However, inherent variations (e.g., due to manufacturing tolerance) introduce heterogeneity into the parameters of any physical system. We demonstrate that such tolerances degrade the observance of recurrences, often leading to complete loss in moderately-sized arrays. We numerically simulate heterogeneous FPUT systems to investigate the effects of tolerances on dynamics. Our results illustrate that tolerances in real nonlinear oscillator arrays may limit the applicability of results from numerical experiments on them to physical systems, unless appropriate heterogeneities are taken into account.
Sunday, December 09, 2018
Lee Smith and Harold Baines Elected to Baseball's Hall of Fame by the Veterans Committee
These are not good picks, especially the one of Harold Baines. They belong more in the Hall of Very Good, rather than in the Hall of Fame. They had very good careers and compiled large numbers in various stats, but in my opinion they don't belong in the Hall of Fame. One of the things to think about when considering whether a player raises or lowers the standards of the Hall at their position. In my view, Lee Smith is a borderline case and I would put him just below the border, but he was the all-time saves leader for a while (and, in general, I can see the arguments in his favor), and he got many Hall of Fame votes for years. Thus, I only view this as a mildly bad pick. I understand it, but I wouldn't put him in the Hall. Part of the issue with Lee Smith has always been the overrating of saves, and I am not surprised that he got in through the Today's Game Era Committee, given the many votes he got from writers over the years in the regular voting. So I can mostly understand his case. But Harold Baines? He was a very good player, but he really lowers the bar at his position. He never got a sniff from the writers, nor did he deserve it.
I'm looking forward to the regular ballot, which will get us Mariano Rivera (who may break the record for highest voting percentage), Edgar Martínez (finally!), Roy Halladay, and maybe (and hopefully!) Mike Mussina will make it. Those four all richly deserve enshrinement in the Hall of Fame.
Maybe Lee Smith's election will help Billy Wagner's case?
Friday, December 07, 2018
"'C' is for Cookie": Academic Evaluation Edition
Comment 2: Apparently, some of my what we did in mathematics in Somerville was an even better idea than I thought. ;)
'The provision of chocolate cookies had a significant effect on course evaluation. These findings question the validity of (student evaluations of teaching) and their use in making widespread decisions within a faculty.' HT @KStackWhitney (photo: Dschwen) https://t.co/lO1v18tmf5 pic.twitter.com/N6epK3GinU
— Erika Marín-Spiotta (@emsaurios) December 7, 2018
(Tip of the cap to Jacquelyn Gill.)
Tuesday, December 04, 2018
Jewelry and Differential Equations
Wolfram Alpha thinks that I may want to find jewelry, even though I asked it about a differential equation. pic.twitter.com/PpfoFUbEUb
— Mason Porter (@masonporter) December 4, 2018
Tales from the ArXiv: Laundering Anti-Money
Wow! I wonder what happens when laundered anti-money collides with laundered money?
Tuesday, November 27, 2018
Tales from the ArXiv: Grandma Got Run Over By a Reindeer
Extra Special Mathematics Terminology
One of my favorite terminology fails in mathematics is the notion of an "extra special group" (which has the added bonus that my undergraduate abstract-algebra professor was unable to say it without also giggling): https://t.co/BsW1dgDYaC
— Mason Porter (@masonporter) November 27, 2018
So inspired!#terminologyfail
Monday, November 26, 2018
"Motor Primitives in Space and Time via Targeted Gain Modulation in Cortical Networks"
Title: Motor Primitives in Space and Time via Targeted Gain Modulation in Cortical Networks
Authors: Jake P. Stroud, Mason A. Porter, Guillaume Hennequin, and Tim P. Vogels
Abstract: Motor cortex (M1) exhibits a rich repertoire of neuronal activities to support the generation of complex movements. Although recent neuronal-network models capture many qualitative aspects of M1 dynamics, they can generate only a few distinct movements. Additionally, it is unclear how M1 efficiently controls movements over a wide range of shapes and speeds. We demonstrate that modulation of neuronal input–output gains in recurrent neuronal-network models with a fixed architecture can dramatically reorganize neuronal activity and thus downstream muscle outputs. Consistent with the observation of diffuse neuromodulatory projections to M1, a relatively small number of modulatory control units provide sufficient flexibility to adjust high-dimensional network activity using a simple reward-based learning rule. Furthermore, it is possible to assemble novel movements from previously learned primitives, and one can separately change movement speed while preserving movement shape. Our results provide a new perspective on the role of modulatory systems in controlling recurrent cortical activity.
Wednesday, November 21, 2018
Introduction to "Confusion Equations"
Tales from the ArXiv: Shit's About to Get Octonionic!
One thing that I find really exciting in the last few years is seeing octonions show up more and more in (in-the-process-of-becoming) practical things!
"Shit's about to get octonionic!", as some of us might say. ;)
Tuesday, November 20, 2018
Adrián Beltré Announces Retirement
I was hoping that Beltré would continue playing, as he's still very effective. Also, if he spent time playing as the oldest player in the Major Leagues, he would have become the first player ever to spend time as both the youngest player in the Majors and as the oldest one.
Sunday, November 18, 2018
A Useful Exercise for Junior Scholars on the Academic Job Market
There are various ways to do such an exercise, and I suspect most people will be doing it without looking at submitted applications in the above way. Gather a set of postdocs in a sufficiently broad field (e.g., "applied mathematics" or even just "mathematics"), as it's a good part of the exercise to see how you evaluate people who are studying topics that are somewhat outside of your expertise. Make sure there is a strict time limit, as you want to see what you notice — both good and bad — about applications in that setting, as it's a realistic setting for how applications are evaluated when it counts. I think you'll pick up some good insights this way, and you can also give each other helpful advice to improve your application materials.
There are various things that we (= senior academics) talk about and give as advice all of the time, but it's good to really try it for yourself. Then you'll see what you notice — both good and bad — in the bundle of applications that you read really quickly.
And, importantly, good luck on your job hunts!
Incidentally, you can find my research statement, teaching statement, and LaTeX file (with drafts of various 'personalization' paragraphs) from my time on the job market, to get my first faculty position, over a decade ago on this Web page
Rubik's Poincaré Disk
#Twisty #puzzle guest tweet. #Hyperbolic #Rubik's cube analogue shown solving in the Poincaré disk model. 24-color puzzle based on the regular {7,3} #tiling. https://t.co/fH15fczvKw pic.twitter.com/3mHMGiygQ2
— Tiling Bot (@TilingBot) November 18, 2018
Friday, November 16, 2018
Which 2-Digit Parent Mathematics Subject Classification Should I Pick as my Primary Classification?
The Mathematics Subject Classification does an "awesome" job of classifying me: https://t.co/chQW9cCotC
— Mason Porter (@masonporter) November 16, 2018
This classification ontology is horrible for applied mathematicians in general, and that can really hurt them on the job market. pic.twitter.com/DnYYBI2Muh
Applied mathematicians face this all the time (though my own research portfolio is a particularly extreme case of MSC failure) on the job market in their job applications for postdoc and faculty positions in mathematics departments in the United States. They forced to submit the standard American Mathematical Society (AMS) cover sheet, and they are then categorized according to an ontology that fails them utterly. It is systematically unfair to applied mathematicians.
The MSC needs to be revamped.
"Layer Communities in Multiplex Networks"
Here are some other details:
Title: Layer Communities in Multiplex Networks
Authors: Ta-Chu Kao and Mason A. Porter
Abstract: Multiplex networks are a type of multilayer network in which entities are connected to each other via multiple types of connections. We propose a method, based on computing pairwise similarities between layers and then doing community detection, for grouping structurally similar layers in multiplex networks. We illustrate our approach using both synthetic and empirical networks, and we are able to find meaningful groups of layers in both cases. For example, we find that airlines that are based in similar geographic locations tend to be grouped together in a multiplex airline network and that related research areas in physics tend to be grouped together in a multiplex collaboration network.
Thursday, November 15, 2018
2018 Most Valuable Player Awards
Some of the rankings are available on this page. Complete point totals are available for the American League on this page and for the National League on this page.
"WHAT IS... a Multilayer Network"
Armin Straub has taken it upon himself to post a comprehensive list of all "WHAT IS..." articles. Mine is the 149th such article.
Wednesday, November 14, 2018
2018 Cy Young Awards
Tuesday, November 13, 2018
2018 Major League Baseball Managers of the Year
What Happens in Columbus Stays in Columbus
Monday, November 12, 2018
Ohtani and Acuña Jr. are the 2018 Rookies of the Year!
The 2018 class of Major League Baseball rookies was very strong indeed!
Sunday, November 11, 2018
"Roll for Initiative"
I think I've decided on what message to put on my tombstone. ;) 👻 pic.twitter.com/i7CbQp9xJO
— Mason Porter (@masonporter) November 11, 2018
(Well, "Roll for surprise." probably conveys the implication better, but it doesn't seem as good.)
Congratulations to Dr. Alejandro Martínez!
His thesis work includes several awesome papers, including this one, this one, this one, this one, and this one. (Alejandro also has additional papers from his thesis era that are in collaboration with other people.)
Alejandro is now a postdoctoral scholar in computational biology in Chile.
Monday, November 05, 2018
Plants that Look like Stones
Lithops, South African plants that have evolved to look like stones. pic.twitter.com/6NQqniKZbJ
— Back To Nature (@backt0nature) November 5, 2018
Sometimes the Refereeing Process Actually Works :)
Me: "Yes, we need to upload the revised version to the arXiv reasonably soon. We changed it substantially (we had a very thorough and helpful referee), so I didn't want to only point you to the old version."
Response: "I hesitated to tell you this in the first message, but I was the referee--thanks for the compliment, all the more meaningful since you didn't know!!"
As frustrating as this can all be (and it is very often indeed), sometimes the process really does work, and sometimes you end up accidentally complimenting somebody a lot instead of accidentally having egg on your face. ;)
Sunday, November 04, 2018
Tales from the ArXiv: The Power Law OF DEATH
And on the heels of The Power Law OF DOOM, we now have claims of The Power Law OF DEATH in a new arXiv paper called "Statistical study of time intervals between murders for serial killers".
In both cases (and as is common), the claims of a power law are unlikely to be justified statistically.
See also The Small-World Network OF LUST, this old blog entry, and this old blog entry.
Wednesday, October 31, 2018
Why are Pencils Yellow?
"Hardtmuth settled on yellow to communicate the graphite’s geographical origins, while also linking its product to the long-held Chinese associations of royalty, and therefore superiority." https://t.co/Mn1LjGRbYQ
— Samuel Arbesman (@arbesman) October 31, 2018
Monday, October 29, 2018
E. L. Ince and the State of Differential Equations in England in 1926
E. L. Ince, being snarky about the state of the study of differential equations in England, in the preface of his classic 1926 book on the subject. pic.twitter.com/nLPXLv5mNt
— Mason Porter (@masonporter) October 29, 2018
Saturday, October 27, 2018
Dodgers Win Game 3 of the World Series 3–2 in 18 Innings!
It's a great day for a ball game. Let's play two!
Many records were set, including longest postseason game (by time) and longest World Series game (by both inning and time). It tied the record for most innings in a postseason game.
(We're still down 2 games to 1, so we have an uphill climb. But today was really exciting. Let's see what tomorrow brings!)
Friday, October 26, 2018
812 Double Pendulums with Different Initial Conditions
This is what 812 double pendulums with different initial conditions look like https://t.co/jklEvfb5EI | https://t.co/ctsPCmFfEJ pic.twitter.com/jMar6rlRma
— Massimo (@Rainmaker1973) October 26, 2018
Monday, October 22, 2018
Spatial and Information Efficiency in Price Lists
theres gotta be a better way to convey this information pic.twitter.com/pHEswDU0TC
— sean (@seanposting) October 21, 2018
(Tip of the cap to Heather Zinn Brooks.)
"Network Science In Education: Transformational Approaches in Teaching and Learning"
Title: Network Science In Education: Transformational Approaches in Teaching and Learning
Editors: Catherine B. Cramer, Mason A. Porter, Hiroki Sayama, Lori Sheetz, and Stephen Miles Uzzo
The book also includes my chapter about developing my undergraduate mathematics course about networks.
Sunday, October 14, 2018
Which Headline Do You Prefer?
Seen in the wild: @sfchronicle using two different headlines for the same article. pic.twitter.com/xPhbvbAMzV
— Mason Porter (@masonporter) October 14, 2018
Using a 'Sort' Function to Order the Chicken and the Egg
Wel that settles that. 😂 pic.twitter.com/0xHvS8Dply
— allie, 🎃 the spookiest 👻 transbian 💀 (@aBagorn) October 14, 2018
(I saw this through a 'like' by Chris Danforth on Twitter.)
Friday, October 12, 2018
A Map of Every Building in America
"A MAP OF EVERY
— Marc Abrahams (@MarcAbrahams) October 12, 2018
BUILDING IN AMERICA" RT @JenLucPiquant @jswatz: Here is the online version of the big, weird, fun thing I was telling you about yesterday... I loved working on this. https://t.co/loRUJhGJJo
A Really Fancy Visual Illusion
Amazing motion illusion.
— Alice Proverbio (@AliceProverbio) October 12, 2018
V5 is firing due to V4 saturation! pic.twitter.com/oNgxRXXN3f
Thursday, October 04, 2018
Amazing Visual Illusion: A Dynamic Müller–Lyer Illusion
This is probably the best illusion I've ever seen. The blue and red lines are all the same length; none is moving or changing size, and they’re all at the same level. Only the arrowheads are moving. https://t.co/bDyeOKXgbC pic.twitter.com/V6KrmLkiPr
— Steve Stewart-Williams (@SteveStuWill) October 4, 2018
(Tip of the cap to Marcel Salathe.)
Wednesday, October 03, 2018
Look at Me, I'm 𝞧 sub d...
Sooo, Max Born, who gave us the statistical interpretation of the quantum mechanical wavefunction, is the grandfather of Olivia Newton-John @olivianj of Grease fame. How did I not know this.
— Michelle Kuchera (@MKizzyy) October 3, 2018
Tuesday, October 02, 2018
How Many First-Authored Papers in "Leading" Journals Does One Need to be Hired as an Assistant Professor?
How many first-authored papers in “leading” journals does an ecologist need to be hired as a tenure-track asst. prof at an R1 university? Not nearly as many as most ecologists think. https://t.co/qpfozljVD0 pic.twitter.com/VrcfEbTjdh
— Dynamic Ecology (@DynamicEcology) October 2, 2018
FYI: I have seen several things on this blog over the years that are relevant far beyond their core ecology audience, so it's worth a look beyond this post.
Update: It's also not required to have lots of citations to get a top faculty job. It would be good to see a distribution of what people have had in practice. (The number of citations listed by Google Scholar for me for 2006 is 53.)
Monday, October 01, 2018
Dodgers Win 6th Straight National League West Division Title!
We face the Atlanta Braves in one of the two National League Division Series starting on Thursday. Go Dodgers!







