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xnoꓤ ǝddᴉʅᴉɥꓒ

@rouxph.bsky.social

intéressé par #maths #scilab, #astronomie, #trail #running , aussi sur 🐘

326 Posts41 Follower53 Folgt
John C. Baez@johncarlosbaez.bsky.social · 3w ago

Wow! If the side length of this "Sierpiński triangle" is 1, the average distance between its points is 466/885. Double wow! The average number of moves in a shortest path between two random states in the n-disc Tower of Hanoi puzzle is asymptotically (466/885)·2ⁿ as n → ∞. (1/n)

A Sierpiński triangle. Take an equilateral triangle, divided it into 4 smaller equilateral triangles, removed the middle one... and then repeat this procedure on the remaining 3, and repeat forever. What's left is a fractal with measure zero. Picture created by Marco Polo and placed on Wikicommons under a Creative Commons Attribution-Share Alike 3.0 Unported license, here: https://commons.wikimedia.org/wiki/File:Sierpinski_triangle.svg
David Masson@psymassondavid.bsky.social · last mo.

Info utile du jour en #psychiatrie: les biais cognitifs Vous, moi. Nous faisons tous des erreurs de raisonnements En psychiatrie, ils entretiennent la souffrance psychique Voici 🔟 très fréquents, avec les troubles dans lequels ils sont particulièrement présents⬇️

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Oliver@oliver48.bsky.social · last mo.

"When reality surpasses fiction! Top: fictional forecast for August 2050, broadcast by French TV in 2014 to warn about the consequences of global warming. Bottom: Real French forecast for yesterday, June 22, 2026… it was not hot enough." via Climate Alert

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Astropierre@astropierre.com · 2mo ago

Le dépôt de prépublications scientifiques arXiv a annoncé une suspension d'un an pour les scientifiques dont les soumissions contiennent des références générées par une intelligence artificielle. 1/2

Dessin. Un scientifique court derrière un robot
Kym @ The Evening Sky Map@skymaps.com · 2mo ago

Sad to hear that Alan Hale passed a few days ago. Dr Hale was the co-discoverer of the widely observed Comet Hale-Bopp which peaked in 1997. The photo shows Alan Hale (left) and Bill Bradfield (right) -- 20th century's most prolific visual comet discoverer (18 comets). 🔭 #comet

Over 200 people of all ages were present at Adelaide University on 24 June 1997 for a public lecture by Dr Alan Hale -- co-discoverer of Comet Hale-Bopp. After the entertaining talk, Dr Hale (left) presented a copy of his book "Everybody's Comet" to Bill Bradfield -- the 20th century's most prolific visual comet discoverer (18 comets). Photo Credit: Kym Thalassoudis
John C. Baez@johncarlosbaez.bsky.social · 2mo ago

In general relativity, a point mass just sitting there is inevitably a black hole. But that's when you're living in 3d space (and one dimension of time). In 2d space, a point mass creates a less drastic singularity: a 'cone point'. I've been studying these cone points lately, just for fun. (1/n)

A disc with a slice cut out of it, and then the cone formed when you glue together the two edges of the slice.
David Monniaux@monniauxd.bsky.social · 2mo ago

Afin de remettre un peu du baume au cœur des gens qui pensent que la recherche en maths va disparaître à cause de l'IA, sachez que j'ai posé le "Monniaux problem" (le terme n'est pas de moi) à l'IA qui avait plié le problème d'ENS et qu'elle a patiné puis avoué son impuissance.