Sunday, March 31, 2019

April Fooling: 2019 Edition

It is April 1st in some timezones, so I'll be starting a round-up of some of the jokes that I see.

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

Yes, that's right: the entire paper is two sentences. There are various short abstracts (with a couple that consist of just one word) — such as those described here, here, and here — but this is the first time that I have seen an entire paper that is this short.

Tuesday, March 26, 2019

Visual Illusion: Starry Night Edition

Very cool!


What Happens in Lake Arrowhead Stays in Lake Arrowhead

Today I'll be heading off to Lake Arrowhead for a few days for the "Data Analytics for Climate and Earth (DANCE):
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

Note: "squares of zenzicubes"!

Wednesday, March 20, 2019

Matrices of Chocolates (and Delicious Missing Data)

Hmmm... this seems like a great way to demonstrate linear algebra and matrices. And then to demonstrate matrices with progressively more missing data... (Delicious missing data.)

Saturday, March 16, 2019

What Happens in Tarrogona Stays in Tarragona (2019 Edition)

Today, I'll start my plane journey to Tarragona for the 2019 Complenet conference. This will be my first time at Complenet.

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

Here is another of today's discoveries in my efforts to figure out how to incorporate emoji into \latex.

Emoji and \Latex: Bowser, Peach, Mario, and the Dynamics of Love



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

And here's Version 1.0 of a Venn diagram for network science.

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

This is my 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

Naturally. That had to be done. ;)

(Tip of the cap to Richard Prather.)

"How do You do Math so Well?"

Yes, YES, and YES!!!!


(Tip of the cap to UCLA mathematics.)

Friday, March 08, 2019

Academic Paper on Evil Laughter

With this new study, soon they'll take over the world!

(Also, Evil will always triumph, because Good is dumb!)

Wednesday, March 06, 2019

Dystopian Lego Art


Monday, March 04, 2019

Beautiful Geometric Art by Saskia Freeke

Saskia Freeke has been creating and posting daily geometric art on Twitter, and I particularly like the one that she posted today.

Go and check out her work!


Sunday, March 03, 2019

What Could Possibly Go Wrong (1840s Edition)

Wow.

Also, look at the follow-up tweet in response.

(What could possibly go wrong? 1840s edition)



(Tip of the cap to Sydney Padua.)

Ancient Doodles Around the World

This, along with Stonehenge, is another thing that I would do just to mess with people if I had a time machine.

Oh wait...

(Tip of the cap to math prof.)

Friday, March 01, 2019

Dividing By Zero on a Mechanical Calculator



(The Pet Shop Boys would be proud.)

Highlighting Lead Junior Scientists in SIMODS

For the journal SIAM Journal on the Mathematics of Data Science (SIMODS), one of the things I did as a member of the editorial board was to suggest (based on having seen this in the journal Biology Open and really liking the idea) to our Editor-in-Chief (Tammy Kolda) that we could highlight lead junior authors with a Q & A once their articles are published. Tammy supported the idea, so we're doing it; and today the first such profile appeared in SIAM News online.

Course Nomenclature in our Imminent Data Theory Major


Thursday, February 28, 2019

A Robot Powered by "Advanced Machine Learning"

;)

Wednesday, February 27, 2019

New XKCD: "Differentiation and Integration"

Today's XKCD, about the algorithmic difference between symbolic differentiation and integration, is superb!

My favorite step of integration is "burn the evidence". ;)

Tuesday, February 26, 2019

The Tennessee Woman Suffrage Memorial


"Hipsters on Networks: How a Minority Group of Individuals Can Lead to an Antiestablishment Majority"

One of my papers came out in final form today. Here is the published paper. And here are some details.

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

I am flying to Knoxville, Tennessee for a working group (on network neuroscience) at NIMBioS.

Saturday, February 23, 2019

A Novel-Writing Algorithm

This also works for academic writing.

Friday, February 22, 2019

"On Brand" Story from Childhood


(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

There is an intriguing new paper on the ArXiv called Deep CNN-based Speech Balloon Detection and Segmentation for 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"

After seeing this news, now I know for sure that we're living in a dystopia.

Tuesday, February 19, 2019

Gandalf's Quote About Social Media

Indeed. ;)


Monday, February 18, 2019

Impending Elimination of Ohio?

I don't know the context, but I hope my friends at Ohio State are ok. (Are you still out there, MBI people?)


Sunday, February 17, 2019

Heinlein's Checklist for Answering Mail

This is brilliant.

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

You can't say that I didn't warn you.


Principal Mason Says: The Homework Sword Fight is On!

I have nothing to do with this idea (despite the principal's awesome name), but I am totally on board with this!

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


Friday, February 15, 2019

Topological Data Analysis of Geographic Distance to Donuts

Clearly, it must be done. It must be done!


My Academic Valentine

This was my contribution yesterday.


Thursday, February 14, 2019

Wonderful Felt Dragons

These felt dragons are wonderful!

(Tip of the cap to Angela Wilkerson Fitch.)

Wednesday, February 13, 2019

"I'm in the Best Academic Shape of My Life"

In the spirit of spring training, I feel like we should start new academic years and grant proposals with comments like "I'm in the best academic shape of my life." and "I'm just going to take it day to day this year.", especially if we've had a recent funding/research dry spell or a bad season (or after bad student reviews).

Tuesday, February 12, 2019

Tales from the ArXiv: Was the AI Eaten by a Grue?

This paper, called NAIL: A General Interactive Fiction Agent, describes an autonomous agent for general parser-based interactive-fiction games.

(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

This thread has lots of great advice for people visiting prospective graduate-school destinations!

Similar ideas apply when considering where to do a postdoc.

(Tip of the cap to Suzanne Sindi.)

Saturday, February 09, 2019

An Illustrated Guide from the 1950s for Using Telephones

This is pretty fantastic!


Monday, February 04, 2019

"The Use of Multilayer Network Analysis in Animal Behaviour"

One of my articles came out in final form today. Here are some details.

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!

Well, we have some spiffy new baseball Hall of Famers: Mariano Rivera, Edgar Martinez, Roy Halladay, and Mike Mussina!

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)

I'll soon be going to San José, Costa Rica for the third time to work on a collaboration on dengue dynamics and control. I'll also be participating in a spiffy panel discussion, where I'll get to meet one of my coauthors in person for the first time.

Tuesday, January 15, 2019

"Money" Laundering: Doing it the Literal Way

Well, it wasn't my intent to discover this, but my debit card and university ID card survived their trip through the washer and dryer remarkably well.

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

Well, there you have it: pure mathematics is kind of like a cult, so let's stop pretending and go all the way. :P


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)

I just got the e-mail to the applied dynamical-systems mailing list with the sad news that Rich Haberman died on December 31st. I used his book in a class my sophomore year (and our best TA was his former student from SMU), and then I met him through the Snowbird conferences, partly because he was one of the few senior people who sometimes did poster presentations. Rich was later my host for my job interview at SMU. My tweet below includes the preface of the second edition of his book.


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?

From my own experimentation, the frequency matters.


(Tip of the cap to Jenna Walrath.)

Tuesday, January 08, 2019

It's Good to Have a Clew (and a Clew)


Monday, December 31, 2018

Scales in the Universe

This website, which illustrates the scales — both large and small — of the universe is wonderful!

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

If only they knew about social contagions...



And here is the beginning of the thread.


Thursday, December 27, 2018

The Final Polishing Step Before Submitting a Manuscript or a Grant Proposal

Naturally. ;)

Friday, December 21, 2018

A Paper that Rejects Itself

What a conundrum! :P

(Tip of the cap to Karen Daniels.)

Thursday, December 20, 2018

Real-Life Binary Trees!


Wednesday, December 19, 2018

Tales from the ArXiv: Motto: "Somebody has to Study this Shit!"

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

So, in other words, they first needed to see the elephant in the room? :)

(Tip of the cap to Steve Strogatz.)

Friday, December 14, 2018

But Are These Data Cookies Reproducible?

I think it's very important to check the reproducibility of these data.

(Tasty, tasty reproducibility.)


(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"

A paper of mine came out in final form today. Here are some details.

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

Lee Smith and Harold Baines were elected to Baseball's Hall of Fame today by "Today's Game Era Committee", an incarnation of 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: "'C' is for cookie. That's good enough for me!"

Comment 2: Apparently, some of my what we did in mathematics in Somerville was an even better idea than I thought. ;)


(Tip of the cap to Jacquelyn Gill.)

Tuesday, December 04, 2018

Does Particle Man Hate Tariff Man?

Does Particle Man hate Tariff Man? And what about Triangle Man?

Jewelry and Differential Equations

I'm sure that many jewel thieves started on the road to crime after failed attempts to solve a differential equation.

Tales from the ArXiv: Laundering Anti-Money

This new paper has the following title: "Scalable Graph Learning for Anti-Money Laundering: A First Look"

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

If I had done this study, I would make a video submission to the Gallery of Nonlinear Images (may it rest in peace), and I would set it to the tune of the song Grandma Got Run Over By a Reindeer. Just saying...

Extra Special Mathematics Terminology


Monday, November 26, 2018

"Motor Primitives in Space and Time via Targeted Gain Modulation in Cortical Networks"

Our paper officially came out in Nature Neuroscience today! Here are some details.

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"

Proposal: "Convection–Diffusion Equations" should be called "Confusion Equations" (or at least "Conffusion Equations").

Tales from the ArXiv: Shit's About to Get Octonionic!

Here is an interesting-looking a new paper (by Michael Freedman, Modjtaba Shokrian-Zini, and Zhenghan Wang ) called "Quantum computing with Octonions".

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

Adrián Beltré has announced his retirement. Next stop, Cooperstown!

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

Here is a story and useful exercise for people on the job market for junior faculty positions or postdocs: When I was a postdoc at Georgia Tech, I was asked to go through about 20 postdoc applications for my thoughts on them. This was for the Center for Nonlinear Science in the physics department. (They had already removed about half of the original set of applications, so these were ones that made the cut to still be considered.) I decided that I would try to do it in one hour. It actually took me about two, even while purposely trying to be very fast. Then, in addition to helping the Georgia Tech folks (which was a good thing to do), I asked myself what I noticed about the applications during that intentionally rushed time. I then used those insights to help me improve my application materials.

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

Wow! This is so awesome!

Friday, November 16, 2018

Which 2-Digit Parent Mathematics Subject Classification Should I Pick as my Primary Classification?

Suppose that you are in the situation that I am in terms of Mathematics Subject Classification, as shown in my tweet below (each term corresponds to one of these), and you are now supposed to pick one of these as your primary classification on the job market. (Note that I am not on the job market, but there was a time long ago when I was a junior scientist and I was faced with this situation.) Which one would you pick?

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"

The final coordinates of one of my papers finally appeared with its journal coordinates, although a published version was already available in August 2017. It just took a while for the full special issue in which it appeared to be published, so only now to do we have our volume, issue, and page numbers. This is my first publication in Journal of Statistical Physics.

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

There were also no surprises with Major League Baseball's 2018 Most Valuable Player Awards. Mookie Betts of the Red Sox won by a landslide in the American League (with Mike Trout finishing second yet again and continuing his historical run of MVP-caliber seasons), and Christian Yelich of the Brewers won by a landslide in the National League. I thought that Mookie Betts would be unanimous; he was ranked first on 28 of the 30 ballots. Yelich was ranked first on 29 of the 30 ballots.

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"

My "WHAT IS..." article on multilayer networks just appeared in published form today in the December 2018 issue of Notices of the American Mathematical Society.

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

the 2018 Major League Baseball Cy Young Awards were announced today, and there weren't any surprises: Jacob deGrom of the Mets ran away with the National League award, and Blake Snell of the Rays won a close race over Justin Verlander of the Astros.

Tuesday, November 13, 2018

2018 Major League Baseball Managers of the Year

The 2018 American League Manager of the Year is Bob Melvin of the Oakland Athletics. The 2018 National League Manager of the Year is Brian Snitker of the Atlanta Braves.

What Happens in Columbus Stays in Columbus

I'm off the Columbus, the only city in Ohio I've ever visited. I'll be at Ohio State again, though mainly visiting a different group than usual this time. I'm looking forward to chatting with their various data folks, as well as chatting with my collaborators. (There is a nonzero intersection in these groups.)

Monday, November 12, 2018

Ohtani and Acuña Jr. are the 2018 Rookies of the Year!

The Angels' Shohei Ohtani, who is both a position player and a pitcher, was the run-away winner of the American League Rookie of the Year Award. I knew he had a good chance, but I thought the balloting was going to be a tight three-way race between Ohtani, and Yankee infielders Miguel Andujar and Gleyber Torres. You can find the rankings and point totals on this page. In the National League, the balloting went as expected: the Braves' Ronald Acuña Jr. is the Rookie of the Year, Juan Soto of the Nationals finished second, and Walker Buehler of the Dodgers finished a distant third. (The final ranking and point totals are both available in the link above.)

The 2018 class of Major League Baseball rookies was very strong indeed!

Sunday, November 11, 2018

"Roll for Initiative"


(Well, "Roll for surprise." probably conveys the implication better, but it doesn't seem as good.)

Congratulations to Dr. Alejandro Martínez!

My doctoral student Alejandro Martínez has now officially finished his D.Phil. (i.e., Ph.D.), with a dissertation called Disordered Granular Crystals.

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

Wow!

Sometimes the Refereeing Process Actually Works :)

We had a paper just accepted to PRE, and I wanted to show it to someone who I thought may not have seen it.

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

First I saw a researcher (Geoff West) claim that there is The Power Law of DOOM! (That's my name for it — not theirs.) At some point, I thought I had that in a blog post, but now I think it was only verbal snarky remarks and a Facebook entry. It started with a talk that he gave years at Oxford in which Geoff started off by saying that he was only going to have very modest conclusions in his seminar, but by the end of the talk, he was predicting the imminent decline of civilization.

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?


Monday, October 29, 2018

E. L. Ince and the State of Differential Equations in England in 1926

Saturday, October 27, 2018

Dodgers Win Game 3 of the World Series 3–2 in 18 Innings!

Wow!

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!)

Monday, October 22, 2018

Spatial and Information Efficiency in Price Lists

Everything's clear, right?

(Tip of the cap to Heather Zinn Brooks.)

"Network Science In Education: Transformational Approaches in Teaching and Learning"

Our book on network science in education just came out. Here are some details.

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?

Using a 'Sort' Function to Order the Chicken and the Egg



(I saw this through a 'like' by Chris Danforth on Twitter.)

Friday, October 12, 2018

A Map of Every Building in America

Wow!

A Really Fancy Visual Illusion

Wow!

Thursday, October 04, 2018

Amazing Visual Illusion: A Dynamic Müller–Lyer Illusion

This visual illusion is amazing. It is a dynamic Müller–Lyer illusion.


(Tip of the cap to Marcel Salathe.)

Wednesday, October 03, 2018

Look at Me, I'm 𝞧 sub d...

I am going to have a field day for puns with this new (for me) nugget of information...


Tuesday, October 02, 2018

How Many First-Authored Papers in "Leading" Journals Does One Need to be Hired as an Assistant Professor?

This is in ecology, but we can think of analogous exercises for mathematics and physics (including also with numbers of citations of papers at the time of being hired).



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!

The Dodgers won the game-163 tie-breaker with the Colorado Rockies to win their 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!