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much faster, which I did not expect

drop all but the last 4 elements using dyadic infix #J 5 }./ i.9

mulling: array programmers wonder about competing with NumPy, why array languages didn't take off... NumPy has an advantage because it's the only way to get Python to perform! Succeeds because of the ignominious traits of its host environment...

Just discovered that of the 26 articles published in Crelle's Journal (one of the oldest math journals still being published) in 1844, 11 of them were by Gotthold Eisenstein, who was 21 years old at the time.

optimizations are so fragile... but as long as there's a workaround, I guess it's enough for established environments (like R)

pandoc is so good

polynomial evaluation in Apple, ~ is reverse and gen. unfolds from a seed I think the array programming implementation is insightful re: array style

verify credit card checksum in Apple demonstrates array style vmchale.github.io/apple/#luhn-ch…

data locality deserves study the way complexity does, it's a matter of physics at the end, even if it's only talked about in specific abstruse ways (caching) agner.org/optimize/optim…

Staggering piece of reportage, data viz & photography from a team at Bloomberg on the ruin that is Gaza. 42 million tonnes of rubble. As an historian specializing in *post-WW2 reconstruction* puts it: “Gaza is something never seen before in the history of urbanism.”

I'm having fun vmchale.github.io/apple/#identif…

human civilisation

🎓We often think (wrongly) of hyperbolic geometry as 1st non-Euclidean geometry. Hyperbolic geometry started with Lobachevsky around 1820's. But Lagrange (implicitly) revealed *symplectic geometry* in his 1808 memoir: The 1st non-Euclidean structure! > youtube.com/watch?v=DARHin…

Roots of parametric polynomials animation. Made with #python, #matplotlib, #numpy and #sympy.

Ranking tech twitter profile pic types in terms of how knowledgeable they are from largest brains to smallest 1. Art that looks like it was drawn by a child or made in mspaint that vaguely resembles user 2. Extremely blurry unposed photo that could be of any dude honestly 3. Hot

September 23-27 takes place an online colloquium on History of Theoretical Physics. sites.google.com/view/plectics-… Speakers: John Cardy Peter Goddard Helen Quinn Gregory Moore Albert Schwarz Emil Martinec Paolo Di Vecchia participation is by invitation, but talks will be recorded