God may not play dice with the universe, but something strange is going on with the prime numbers -- Paul Erdös (1997)

Just learned about this handbook for making complex visual images such as charts, diagrams, mathematical graphs, and more. It's super helpful for anyone posting educational content online! Plus, it's #CC licensed. #a11y pcc.edu/instructional-support/

@ColinTheMathmo I'll go for "theorem".

@JordiGH I doubt that Hitchcock invented the concept. "The Mousetrap" is a play which has been running since 1952, and the audience is asked after every performance not to reveal the twist ending.
In the back of my head there's a 19th C book with a similar warning about revealing the twist, but I can't think what it was

Trying to have a conversation with a colleague, but all I can think about is how comfy this new jumper is.

Food

Is my daughter too young for NP-hard problems?

@bmreiniger @bstacey yeah, me too

mathstodon.xyz users: I've found out why LaTeX sometimes isn't rendered: it's a bug in MathJax! See github.com/mathjax/MathJax-src for the details.
For now, I think you can avoid it by not putting a math delimiter at the start of a line. Even a single space should be enough to avoid the bug.

> We have computed the very first chosen-prefix collision for SHA-1. In a nutshell, this means a complete and practical break of the SHA-1 hash function, with dangerous practical implications if you are still using this hash function. To put it in another way: all attacks that are practical on MD5 are now also practical on SHA-1. Check our paper here for more details.

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When on eduroam do as the umm ... eduroamans do??

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Food

@bremner Me, a Mathematica user for decades: Why yes, (#^%%)! & /@ %%% seems like a perfectly reasonable thing to write, why do you ask?

Ed Pegg, Jr has started updating mathpuzzle.com/ again! Hooray!

John Wallis and the Roof of the Sheldonian Theatre: soue.org.uk/souenews/issue4/wa, via an @aperiodical description of a 3d print of the same structure, aperiodical.com/2019/11/my-adv

It's an elegant way to build a wide roof out of short beams with no joinery. But the history is somewhat lacking: Similar structures were known much earlier to Leonardo Da Vinci, Villard de Honnecourt, and Sebastiano Serlio. See Sylvie Duvernoy, "An introduction to Leonardo's lattices", doi.org/10.1007/978-3-7643-872

how many of these are there

Elf (Nirvana Systems/Ocean Software, 1992) #DOSGaming

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.