A surface obtained by gluing six heptagons. Universal cover in the Poincaré model (the same character shown = the same point of the surface). Weapons to show that this is not orientable (it has Euler characteristic -1). Constructed by DivisionByZero [ https://t.co/zgD3J7pG4f ] pic.twitter.com/J1MzJKCkYl
— Zeno Rogue (@ZenoRogue) June 20, 2018
1 day ago
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