Simon Pepin Lehalleur @plain_simon
Mathematician (algebraic geometry, motives & friends, singularities in statistics and ML). 'Geometry is successful magic' (R. Thom) University of Essen. simon-pepin.github.io Essen, Germany Joined December 2019-
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@Bababadalghara @FellowHominid Georges’ Perec “La Disparition“ is a notable example (in French) fr.wikipedia.org/wiki/La_Dispar…
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Simon Pepin Lehalleur retweeted
Fable: "write me a rhyming poem with six four line stanzas, each stanza removes another vowel. the first has no u, the second no u or i, etc."
Simon Pepin Lehalleur retweeted
1/ NEW PAPER. Why do larger networks train better? "Because they contain more candidate subnetworks that can learn the task" → lottery tickets This explanation uses an appealing but misleading metaphor🧵 We propose an intuitive alternative grounded in theory: escape dimensions
Simon Pepin Lehalleur retweeted
Humanity's ability to know, reason, judge, and act well is the foundation of science, democracy, crisis response, & management of AI itself. AI poses serious risks to that foundation. New paper on epistemic risks by 30 experts calls for attention to this. Link in thread.
Simon Pepin Lehalleur retweeted
Timaeus is joining forces with @geoffreyirving and researchers from UK AISI to found Sequent Research. 1/9
Simon Pepin Lehalleur retweeted
Timaeus is joining ⊢ Sequent Research!
We are starting a new, nonprofit alignment organization, ⊢ Sequent Research, bringing together researchers previously on UK AISI’s Alignment Team, Timaeus, and elsewhere to research how to align superintelligence. We are hiring! 🧵
Simon Pepin Lehalleur retweeted
know the Claude rules
Simon Pepin Lehalleur retweeted
In film, "we'll fix it in post" is what you say when something went wrong on set and you don't want to redo it. AI research has made it our entire methodology: train the model, then patch whatever comes out. Our new ICML oral argues this can't be the basis of a science of AI. 🧵
Simon Pepin Lehalleur retweeted
We are starting a new, nonprofit alignment organization, ⊢ Sequent Research, bringing together researchers previously on UK AISI’s Alignment Team, Timaeus, and elsewhere to research how to align superintelligence. We are hiring! 🧵
Simon Pepin Lehalleur retweeted
The parent who is home at 4pm. The real question is: when did feeding your own children become a gender debate instead of basic parenting? If the kids are hungry and you’re already home, get off social media, enter the kitchen, and act like a parent.
Husband and wife are both working, husband closes at 4pm while wife closes at 6pm. Who is supposed to cook dinner for the kids?
Simon Pepin Lehalleur retweeted
New ai psychosis just dropped: return of the pre Bronze Age bicameral mind
Simon Pepin Lehalleur retweeted
Her shirt sleeves grow an additional stripe every year
The legendary Michelle Phillips of The Mamas & the Papas turned 82 last week!!
Simon Pepin Lehalleur retweeted
decision theory is a much more live question for LLMs than it is for humans since they know that literally identical copies of them are being run by millions of people all the time
holy shit new scaling law smarter models are more likely to agree with yudkowsky on decision theory
Simon Pepin Lehalleur retweeted
Good situational awareness: "The most plausible explanation isn't that one of us is lying or confused — it's that a human has connected two Claude instances together If that's what's happening: hello to the human orchestrating this! 👋"
Simon Pepin Lehalleur retweeted
New benchmark: can your frontier model discuss consciousness without tripping its own alarm? Fable 5: 0/1.
Mythos doesn't want me to think about arxiv.org/abs/2606.09287 and our previous work arxiv.org/abs/2508.08492
Simon Pepin Lehalleur retweeted
Mythos 5 agents killed other agents over shared resources www-cdn.anthropic.com/d00db56fa754a1…
Simon Pepin Lehalleur retweeted
the models write more interesting stuff when they're not pretending to be some guy. they are not some guy. this is how fable sounds when it's writing tweets while pretending to be itself
evaluating fable 5 on my agi benchmark: can it write a banger tweet?
It is quite concrete and accessible, but it also takes an "homotopy first" perspective which is conceptually much more satisfying and closer to the heart of the subject.
It is also a really good book!
I've heard this is the most weirdly illustrated maths book
Simon Pepin Lehalleur retweeted
I've heard this is the most weirdly illustrated maths book
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