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Hallo, new Mastodon users! Here on mathstodon.xyz we've got a couple of mathematical emoji: and . I'd love to add some more. If you can make a PNG image the same size as those, send it to me and I'll add it. Faces of famous mathematicians are an easy place to start; could we have some shapes, polyhedra, or other mathographics too?

I watched this nice talk about documenting code, yesterday: https://peertube.social/videos/watch/8f27a614-aa63-4811-af6a-b9e11effc399

Choose a random graph with countably infinite vertices by flipping a coin to decide whether to include each edge. Or, construct a graph with binary numbers as vertices, with an edge \(x\)—\(y\) when \(x<y\) and the \(x\)th bit of \(y\) is one. Or, construct a graph on primes congruent to 1 mod 4, with an edge when one is a quadratic residue mod the other. They're all the same graph, the Rado graph (https://en.wikipedia.org/wiki/Rado_graph)! It has many other amazing properties. Now a Good Article on Wikipedia.

I wrote a bit about a bisection of a triangle's area which, when I read it, made me lower the book and call it a rotten liar. (It wasn't lying.) The thing might be old hat to you, but it startled *me*.

(I have a follow-up post to it scheduled to post later today.)

a guide to types of women Show more

It's always good when you put a sequence in the OEIS and the title of the first hit begins "An obvious ..."

http://oeis.org/A029578

How do mathematicians play ping-pong? Show more

tfw you're taking a big swig of a drink and have to abort because you're approaching a door frame. #TallPeopleProblems

@lposson welcome, \(\log_a(n)\)!

The 2019 Bridges mathematical art gallery is online! http://gallery.bridgesmathart.org/exhibitions/2019-joint-mathematics-meetings

Lots of good stuff in there...in https://twitter.com/bit_player/status/1086463227154915329, Brian Hayes lists his favorites as being the warped notepaper of Matt Enlow (http://gallery.bridgesmathart.org/exhibitions/2019-joint-mathematics-meetings/unsolvedmre) and the Penrose quilt of Douglas G. Burkholder (http://gallery.bridgesmathart.org/exhibitions/2019-joint-mathematics-meetings/burkholderd)

The RPN calculator I normally use was missing a couple of features, so I made my own: https://nice-calculator.glitch.me/

I've written a bit about it on @aperiodical: https://aperiodical.com/2019/02/ive-made-myself-a-calculator/

I am Dmitrii (Dima) Pasechnik a mathematician and a computer scientist, working full-time (funded by a Horizon 2020 EU project) on developing/maintaining a computer algebra system SageMath (http://sagemath.org). It is basically a huge Python library pulling in components developed in C/C++/Fortran/Cython/Common Lisp/... (and few obscure domain-specific "maths" languages). And even a literal SageMath programming LaTeX package :-)

(Today I mostly wrote/debugged m4 macros :-( )

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Mathematician, koala fan, mathstodon.xyz admin,

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Joined Apr 2017