Simon Pepin Lehalleur
@plain_simon
Mathematician (algebraic geometry, motives & friends, singularities in statistics and ML). 'Geometry is successful magic' (R. Thom) University of Amsterdam.
"Pessimism of the Algebra, optimism of the Geometry"
Steve Jobs voice: "are you getting it yet? These are not four separate products"
"Instead of fire, earth, water, and air we now have space, time, matter, and energy."
i have a friend, well over 6’, jacked, well-read, in touch with his feelings, ethical vegan, trilingual, built a little different, wants companionship more than anything, but can’t get his creator to make him a female mate
Extremely funny that one of the replies is like "have you considered helping her" and he's like "you know what, I had not, I will try that"
Can a woman get her kids ready for school without shouting? Please recommend ways to do it for me because my wife shouts too much.
For a change of pace, here's a joke from Communist Poland. Wlodek wants to deposit his money, saved carefully in a mattress, to the bank. He walks in. Wlodek: "I want to make sure my 50 zlotys are safe. What happens if someone robs the bank?" Banker: "No worries. The main…
The true nature of bird migration was finally understood in western science thanks to the discovery of this stork in Germany which was still alive despite having a central African hunter's spear through its neck
share your favorite piece of bird lore
We really need a lot more R&D on how to build the internet for the AI age. A lot of the web is currently glued together by CAPTCHAs and AIs not being good enough to bypass them and do stuff across the internet But this glue is not going to last for long. Soon it will be too…
It’s either so over or we’ve never been so back
It seems really nuts that we are living in the most mind-bendingly advanced technoscientific society ever and yet the answer to every theory here about the health effects of *bread* is "uhh (sweating) we're really not sure."
only referring to him as "miles davis from jazz" from here on out
Miles Davis from Jazz is reportedly coming to Fortnite. (Source: @FNBRintel)
going on Jubilee with 20 people who assert objects are isomorphic without specifying the isomorphism
The original PNT (by Hadamard and de la Vallee Poussin, 1896) had the error bound O(x exp(-c (log x)^(1/2))) We call that the "Strong" PNT; although it's not the strongest known -- the world record replaces the 1/2 with 3/5 (Korobov, Vinogradov). If you can replace 3/5 with 1,…
What is "Medium" strength in this context? Tighter bounds, as opposed to a strong proof assuming the Riemann Hypothesis?
Our starting point for understanding solid materials is an idealized crysta: all atoms in infinite perfect registry. However, there are many examples where the entire functionality comes from deviations from this ideal. The defect is often the device, including in the device on…
Me: if there’s anything you learn from this kitchen, son, it’s that you measure garlic with your heart. 16 yo: with my heart. Me: yes. Some recipes will tell you some nonsense of “1 clove of garlic minced” and that is a cold-hearted person. 16 yo: they do not understand the…
Tong Zhou: A Microlocal Theory for Zariski-Constructible Sheaves on Rigid Analytic Varieties arxiv.org/abs/2507.18604 arxiv.org/pdf/2507.18604 arxiv.org/html/2507.18604
did u know you can use the new Gemini image segmentation feature in… a lot of different ways
did u know you can use the new Gemini image segmentation feature in… a lot of different ways
It's just 10 pages of "I have discovered a truly marvelous proof of this, which this context window is too narrow to contain."
planning to use this picture in a talk to explain what a foliation is, feeling extremely Canadian
Google exists bc of a grand bargain: scrape the open web, and profit from directing traffic to the best sites. Around 2010, the betrayal began. YouTube artificially ranked above other video, then over time maps results injected, shopping, flights, events. Now AI answers.
This literally shut me down. I used to get clients who want to make toys because they visited my site for blog posts and information. Now they don't need to. Google scraped my content and regurgitates it at the top of the search. Zero visitors now. No clients.
Gert-Martin Greuel, Gerhard Pfister: The Splitting Lemma in any Characteristic arxiv.org/abs/2507.17078 arxiv.org/pdf/2507.17078 arxiv.org/html/2507.17078