Pinned toot

Hallo, new Mastodon users! Here on mathstodon.xyz we've got a couple of mathematical emoji: :gauss: and :lovelace:. 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?

The baby's stomach seems to be able to measure three hours to the second.
Is it too late to apply for the longitude prize?

Our second L-P is finally out. Early reviews describe him as "sleepy" and "cuddly".

I can't imagine what prompted this integer sequence: "Least multiple of n in which the n-th digit from left is 3."
oeis.org/A113558

Interactive 3d knot table: prideout.net/knotgl/

One of many interesting visualizations on "the little grasshopper", prideout.net/, by Philip Rideout (author of the svg3d Python library that I linked earlier)

puzzle solution, PostScript source code 

@dudeney_puzzles graphics in PS
%!PS-Adobe-2.0

% A6 paper
<< /PageSize [297 420] >> setpagedevice

/scaling 30 def

/line {
newpath
0 0 moveto
0 1 lineto
stroke
} def

/page-center {
currentpagedevice /PageSize get {
2 div
} forall
} def

page-center translate
scaling scaling scale
1 scaling div setlinewidth
6 {
60 rotate
line
} repeat

6 {
0 1 translate
2 60 mul rotate
line
-2 60 mul rotate
0 -1 translate
60 rotate
} repeat

showpage

I love it when I rediscover an integer sequence with an enormous OEIS entry: oeis.org/A008292

Hello, I'm a postdoctoral researcher at Rikagaku Kenkyusho (RIKEN) (Wako Campus) in the iTHEMS program working in the field of mathematical , data , and . I am a founding member of Math+ and a member of the Solid Modeling Association, Eurographics, SIAM as well as of the SIAM activity group on Geometric Design and the Solid Modeling Association. Furthermore, I am an associate editor of the Journal of Mathematics and the Arts. 🤗

\( R_{\mu\nu} - \frac{1}{2} R g_{\mu\nu} + \Lambda g_{\mu\nu} = \frac{ 8\pi G}{c^4} T_{\mu\nu} \)

I've made a clock which runs through every permutation of a deck of cards, swapping one pair every second.
It's not very useful.
permutation-clock.glitch.me/

Idea: a page which shows a bijection between the first 52! unix timestamps and shuffles of a pack of cards. Once a second, it moves to the next one.

I've made a patch for just this feature at gist.github.com/christianp/629, though it's only really useful in conjunction with the rest of my mathstodon branch, which uses MathJax to render LaTeX in toot content: github.com/christianp/mastodon

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mathstodon.xyz now has a live preview and completion of LaTeX!
This has been on my to-do list for a long time. You no longer need to worry if LaTeX will display properly or not.

Poor LaTeX in a closed-access journal 

This is pretty dire, from a closed-access journal: these matrices are typeset using \array{cc} environments, but they just used a horizontal space instead of a column separator, so nothing is aligned.
Value added!

Not sure why so many people are reminding me that leap seconds exist.

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