Christian Lawson-Perfect @christianp@mathstodon.xyz
- Homepage
- http://somethingorotherwhatever.com
- Location
- Newcastle upon Tyne, UK
- Pronouns
- he/him
- Favourite number
- 3435
Admin
Mathematician, koala fan, mathstodon.xyz admin,
⅓ of https://aperiodical.com. He/him
Joined Apr 2017
Pinned toot
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?
Christian Lawson-Perfect
boosted
Just noticed that the LaTeX → unicode replacement on mathstodon.xyz wasn't there - it was on the mathjax-only feature branch!
Now turned back on. Enjoy ∀!
Is anyone planning anything for the next palindrome day, 2020-02-02?
it looks like it's just ignoring large parts of my query. "derivative of {x,x^2}" produces the same result: https://www.wolframalpha.com/input/?i=derivative+of+%7Bx%2Cx%5E2%7D+
I still can't see how you get from {x,x^2} to x^3+x^2.
I can't work out what WolframAlpha is doing wrong with this query: https://www.wolframalpha.com/input/?i=derivative+of+%28vector%7B1%2C2%7D+dot+vector%7Bx%2Cx%5E2%7D%29+with+respect+to+x"derivative of (vector{1,2} dot vector{x,x^2}) with respect to x"
It can do the dot product properly on its own: https://www.wolframalpha.com/input/?i=vector%7B1%2C2%7D+dot+vector%7Bx%2Cx%5E2%7D
Christian Lawson-Perfect
boosted
john venn: ok now fellas, i know you all hate me for my obsession with making diagrams, and also for my obsession with set theory, but which of you hate me for both? observe,
The phishing is coming from _inside_ the social network!
This from the "bet you can't kick yourself in the nuts" school of psychology
Christian Lawson-Perfect
boosted
God may not play dice with the universe, but something strange is going on with the prime numbers -- Paul Erdös (1997)
Christian Lawson-Perfect
boosted
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 https://www.pcc.edu/instructional-support/wp-content/uploads/sites/17/2017/11/complex-images.pdf
Trying to have a conversation with a colleague, but all I can think about is how comfy this new jumper is.
#ActuallyAutistic
mathstodon.xyz users: I've found out why LaTeX sometimes isn't rendered: it's a bug in MathJax! See https://github.com/mathjax/MathJax-src/issues/421 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.
Christian Lawson-Perfect
boosted
> 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.
Christian Lawson-Perfect
boosted
When on eduroam do as the umm ... eduroamans do??
Christian Lawson-Perfect
boosted
@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 http://www.mathpuzzle.com/ again! Hooray!
Christian Lawson-Perfect
boosted
John Wallis and the Roof of the Sheldonian Theatre: https://www.soue.org.uk/souenews/issue4/wallis.html, via an @aperiodical description of a 3d print of the same structure, https://aperiodical.com/2019/11/my-adventures-in-3d-printing-wallis-sheldonian-theatre-roof/
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", https://doi.org/10.1007/978-3-7643-8728-0_1
- Homepage
- http://somethingorotherwhatever.com
- Location
- Newcastle upon Tyne, UK
- Pronouns
- he/him
- Favourite number
- 3435
Admin
Mathematician, koala fan, mathstodon.xyz admin,
⅓ of https://aperiodical.com. He/him
Joined Apr 2017
