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Simon Pepin Lehalleur
16.3K posts
Simon Pepin Lehalleur
@plain_simon
Mathematician (algebraic geometry, motives & friends, singularities in statistics and ML). 'Geometry is successful magic' (R. Thom) University of Essen.
Essen, Germany Beigetreten Aralık 2019
6.6K Folgt3.9K Follower
Simon Pepin Lehalleur retweetet
I love that the actual target is not mentioned, and the direction of the arrow implies that they launched toward Europe. You would never know they tried to hit Diego Garcia in the Indian Ocean, the island from which the US has been running attacks on Iran from.
Israel Defense Forces@IDF
❗️The Iranian terrorist regime launched a long-range missile for the first time since the start of Operation Roaring Lion that could reach a distance of ~4,000 km. During Operation Rising Lion in June 2025, the IDF revealed that the Iranian regime has intentions to develop missiles with a range of 4,000 km, which pose a danger to dozens of countries in Europe, Asia and Africa. The Iranian regime denied this. We have been saying it: The Iranian terrorist regime poses a global threat. Now, with missiles that can reach London, Paris or Berlin. The Iranian terror regime has carried out attacks against 12 countries in the region and is developing a capability that poses a much broader threat.
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Simon Pepin Lehalleur retweetet
Trump: “Robert Mueller just died. Good, I’m glad he’s dead. He can no longer hurt innocent people! President DONALD J. TRUMP”
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Simon Pepin Lehalleur retweetet
Keep seeing this particular graphic on my feed and it's quite annoying, because that fence is not in the middle of nowhere, and there is an obvious reason for it
Chris Lakin@chrislakin
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Simon Pepin Lehalleur retweetet
this is all limited animation, part of what makes anime so great is that the japanese animators knew where and how to cut corners.
James Lucas@JamesLucasIT
Damn, this was animated in 1987
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Simon Pepin Lehalleur retweetet
This man said he was teleported to a Waffle House and his car was "lifted up" with him while he was driving and dropped in a ditch near a church....he's now the head of FEMA's Office of Response and Recovery.
themindshield.com/trump-fema-off…
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Simon Pepin Lehalleur retweetet
HHS Secretary RFK Jr: The polio vaccine “killed many, many more people” than polio ever did.
Fact check - Radioactive garbage
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Simon Pepin Lehalleur retweetet
Home Alone hit France like an atom bomb.
Vintage Maps@vintagemapstore
Evolution of the most popular First Names in France along the years (1946-2011) - boys edition
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Simon Pepin Lehalleur retweetet
Opus 4.6 is hugely better at Pokemon:
• Opus 4.0 took 1,000 hours to get half way through
• Opus 4.5 could almost finish in 1,000 hours
• Opus 4.6 was another 10x faster!
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Simon Pepin Lehalleur retweetet
A few months ago I bumped into Anand Patel, who had been my algebraic geometry TA in college, visiting Google DeepMind. He agreed to try out an agent I was building called Aletheia.
Fast forward: Anand prompted Aletheia to solve a problem about simplicity of the Hodge bundle on M_g that had been floating around (a part of) the algebraic geometry community for at least ten years. Check out his paper at arxiv.org/pdf/2603.19052
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Simon Pepin Lehalleur retweetet
Simon Pepin Lehalleur retweetet
Taeyoung Lee, Gregory S. Chirikjian: Global Tensor Field Formulation of the Fokker-Planck Equation on Riemannian Manifolds arxiv.org/abs/2603.18320 arxiv.org/pdf/2603.18320 arxiv.org/html/2603.18320
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Simon Pepin Lehalleur retweetet
Kiyoshi Takeuchi: The Legend of Masaki Kashiwara and Algebraic Analysis arxiv.org/abs/2603.18800 arxiv.org/pdf/2603.18800 arxiv.org/html/2603.18800
Filipino
Simon Pepin Lehalleur retweetet
The evolution of mathematics towards higher level of abstraction leads to a bigger involvement of illustrations and diagrams, not vice versa
Bulgaria 🇧🇬 English
Simon Pepin Lehalleur retweetet
Ireland’s population chart remains a wild one to look at. The country has still not recovered from the Great Famine (1845-52).
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Simon Pepin Lehalleur retweetet
We are deeply saddened to learn of the loss of Prof Heisuke Hironaka on 18 March 2026, aged 94.
sp.m.jiji.com/english/show/4…
May he rest in peace.💐
He was awarded the Fields Medal in 1970. @HarvardMath
📙"Complex Analytic Desingularization" (2018, Springer) link.springer.com/book/10.1007/9…
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Simon Pepin Lehalleur retweetet
My daughters' sleeping positions change every time I see them; I never get tired of watching them 🤣
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Simon Pepin Lehalleur retweetet
just made some updates to the Rob Burbea jhana retreat app, and I'll be going through myself for the next 20 days (or until our baby arrives!)
→ jhanaretreat.com
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@TenszNeumann @mayankjha1089 @ModalMetamodel I don't understand, why does the characteristic have to be a standard natural number? Why is it still not of (nonstandard) characteristic p?
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@mayankjha1089 @ModalMetamodel You take a non standard model of peano axioms of natural numbers. Then you can get numbers there, that are prime, but that they appear in the usual model we all are used too. Then the quotient by that prime produce a field of characteristic 0 (since 1 cannot add up to that prime)
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Simon Pepin Lehalleur retweetet
Great demonstration that a self-model can function as a low-dimensional generator for a high-dimensional preference bundle.
Alignment may arise from identifying self-models that generate stable, prosocial invariants across models' behavior.
Owain Evans@OwainEvans_UK
New paper: GPT-4.1 denies being conscious or having feelings. We train it to say it's conscious to see what happens. Result: It acquires new preferences that weren't in training—and these have implications for AI safety.
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Simon Pepin Lehalleur retweetet
physical systems (orbits/fluid mechanics) may look complex, but are often governed by simple equations/few parameters. can current self-supervised methods learn the underlying physics?
our new paper finds that learning in latent space may be the key!
arxiv.org/abs/2603.13227🧵
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