I’d tell you a Fibonacci joke, but it’s probably as bad as the last two you’ve heard combined.

This is not entirely my idea, the original paper includes a subdivision of an annular region. The provided code is all Mathematica though, which I don't have a copy of, so I coded up a quick&dirty version in OpenFl and threw it on Neocities

it is very dirty: double click to split a cell, scroll your mouse to cycle through cells

roywig.neocities.org/truchet/v

Survey on fusible numbers: arxiv.org/abs/1202.5614

Fusible numbers are what you get from 0 by operations $f(x,y)=(x+y+1)/2$ restricted to $|x-y|<1$. They model a puzzle of measuring time intervals using 1-minute fuses whose ends you can light when another fuse burns out, and are well-ordered with unknown order type. @jeffgerickson calls his (wrong) conjecture "one of my bugs that really should be better known" and points out the lack of progress since 2012: mathstodon.xyz/@jeffgerickson/

euro-math-soc.eu/news/18/11/16
Turkey has arrested Betül Tanbay (the former president of the Turkish Mathematical Society), accusing her of implausible crimes, as they have already done with so many others, especially other academics. The EMS asks the "research community to raise its voice against this shameful mistreatment of our colleague, so frighteningly reminiscent of our continent's darkest times". So count me as one of the voice-raisers.

Intuitive illustrations of possible control flows of a computer program. From Herman Goldstine and John von Neumann, _Planning and Coding of Problems for an Electronic Computing Instrument_, Part II, Volume 1 (1947).

Two new arXiv preprints:

The first shows that if a graph $G$ has a non-crossing straight-line drawing (a.k.a. Fáry drawing) in which some set $S$ of vertices is drawn on a single line then, for any point set $X$ of size $|S|$, $G$ has a Fáry drawing in which the vertices in $S$ are drawn on the points in $X$.

The second shows that, in bounded degree planar graphs, one can always find such a set $S$ of size $\Omega(n^{0.8})$.

Survey on fusible numbers
Article by Xu, Junyan
In collection: Easily explained
We point out that the recursive formula that appears in Erickson's presentation "Fusible Numbers" is incorrect, and pose an alternate conjecture about the structure of fusible numbers. Although we are unable to solve the conjecture, we succeed in establishing some basic properties...
URL: arxiv.org/abs/1202.5614
PDF: arxiv.org/pdf/1202.5614v1

MathMechs extensors tetromino.

Artist uses bare hands to sculpt soda cans into beautiful geometric shapes: boingboing.net/2018/10/24/arti

Kokichi Sugihara wins the Best Illusion of the Year (again) with an orthogonal polyhedron! Or maybe a different orthogonal polyhedron. Or maybe a third one. Or maybe it's not actually orthogonal at all...

I have constructed a Czech math joke!

"One such study, recently published in the European Journal of Social , failed to find evidence that stereotype threat significantly impaired ’s inhibitory control and performance.

... “The ‘answers’ appear to be more complex than I had originally hoped, however. My has found mixed evidence for the theory of threat, and large-scale replication studies have sparked controversy over the robustness of this phenomenon.”"

psypost.org/2018/10/study-fail

Happy Black Friday. As is traditional, wear hooded black robes and listen only to Norwegian black metal music today.

this result will surprise literally nobody but it's still important

"Reviewer bias in single- versus double-blind peer review"

pnas.org/content/early/2017/11

spoilerssss: " ... single-blind reviewers are significantly more likely than their double-blind counterparts to recommend for acceptance papers from famous authors, top universities, and top companies. The estimated odds multipliers are tangible, at 1.63, 1.58, and 2.10, respectively."

😱

The "efficiency gap" makes sense only if you think 3--1 majorities are ideal.
fivethirtyeight.com/features/t

A Mastodon instance for maths people. The kind of people who make $\pi z^2 \times a$ jokes.
Use $ and $ for inline LaTeX, and $ and $ for display mode.