Bela bildo :

Le Grand Chantier

Paris, France, 1888

#Paris #France #Isabelle #Eiffel #Art
https://www.instagram.com/p/DYFekZYiIU8/?igsh=MWU3c2t5OTVjdG84cw==

Why is there no Isar-like structured proof mode in Lean, like there is for Isabelle? In https://leanprover.zulipchat.com/#narrow/channel/270676-lean4/topic/Thoughts.20about.20Isar.20and.20Lean/near/591162685 I offer two answers:

1. There is now (AI-assistet proof of concept): https://github.com/nomeata/lean-lisar, proving that it's certainly well possible.
2. It doesn’t seem to be needed that much. (Assume it were. Someone would have built it if it is possible. And from the point above it follows that it is possible.)

#leanProver #isabelle #itp

Archimedes' Cattle Problem in #isabelle

Archimedes challenged mathematicians with a puzzle that involved computing the size of the cattle herd, based on a number of linear equations and other restrictions.

Since the solution has 103,266 digits, solving the problem was far beyond the computational capabilities at the time. The first approx solution was computed by Amthor in 1880, and the exact solution by Williams et al. using electronic computers in 1965.

https://www.isa-afp.org/entries/Archimedes_Cattle.html

#math

Hey Isabelle, I see you! Looking pretty fancy today fam! Also, Happy 25th Anniversary to Animal Crossing! Photo taken at @anotheranimecon_aac 2025!

#cosplay #videogame #nintendo #animalcrossing #isabelle #cosplaygirl #cosplayphotography #cosplayersofmastodon

🇺🇦 #NowPlaying on #KEXP's #VarietyMix

Isabelle:
🎵 Amstramgram

#Isabelle

https://wizzzcompilation.bandcamp.com/track/amstramgram

https://open.spotify.com/track/6GnOCSqUFYivljSmTBv5vM