Machine learning researcher at @GoogleDeepMind & mathematician. Host of The Cartesian Cafe podcast. All opinions are my own.

London, England
Joined May 2017
Quantum field theory textbooks have been lying to you or have left you confused. For a typical passage like the following from Peskin&Schroeder - what does it mean to do a change of variables on an ill-defined path integral? For perturbative QFT, my paper resolves this issue: 🧵
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Timothy Nguyen retweeted
I’m excited to announce that I will be working at the Mathematical AI Safety Institute (MAISI) full-time as its founding Scientific Director! This means I will not be joining OpenAI as an employee, though I will still be collaborating with them, and I’m happy to announce that OpenAI will be supporting MAISI. They have offered us $10MM in API credits, and access to their latest models for our research use. Moreover, they will be participating in a multi-lab AI safety workshop we are organizing for next year with other frontier AI labs. As an independent research institute, we are also in conversations with other labs and AI safety orgs about how MAISI can collaborate with them and contribute quickly to AI safety research across the industry. As we’ve seen over the past few weeks, the need for action on AI safety is extremely urgent. Research is an important part of that, and mathematicians have an important role to play!
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Are there any public confessions by senior mathematicians of the form “Had I known during my student days that AI was gonna drop on math like it did on October 6, 2026 I would have become X instead.”? Curious what the values of X are. I don’t know who it’s from but there’s an adage that goes “you should only do math if you can’t see yourself doing anything else.”
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Timothy Nguyen retweeted
We are poised to translate all known math into formal code.
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Timothy Nguyen retweeted
While we wait for the OpenAI slop storm, here is some open-source Yang-Mills slop! github.com/ethanwsussman/Yan… Ethan Sussman and @__alpoge__ are completing/clarifying Balaban's existence program for 4d Yang-Mills. For now they have Levent-style slop. The goal is to get a readable PDF and I'm told everyone is welcome to participate. The repo is public.
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I'm really enjoying looking at the list of problems openai has solved. What a rare panoramic view of math. It's like a new planet was discovered and all its artifacts got curated and put into a museum. Exciting times! Though personally, I'm still waiting for the day AI can do something open-ended like find a mathematical rigorous unification of quantum field theory and general relativity.
We’re releasing a broad range of new mathematical results produced by an internal frontier model. We’ve been consulting with the independent Advisory Group on Mathematics and Artificial Intelligence at the Institute for Advanced Study, and we have drawn on their advice and public recommendations to inform how we release these results. github.com/openai/math
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Timothy Nguyen retweeted
Amélie Loher and I are releasing skill files for writing math research articles. The purpose of these skills is to take LLM slop-written papers and de-slop them while at the same time checking for mistakes and improving exposition. You can start either from (i) a proof outline in some format (but no paper), or (ii) an existing draft of a paper. There is also a separate set of skills for writing a "visual paper" (a webpage for the paper with extra explanations, illustrations and animations). It takes a paper and builds a webpage for you.
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Timothy Nguyen retweeted
I wonder what @GaryMarcus thinks of this bet now. It was in a thread originated by @MCHammer that seems to be deleted, but I saved the screenshots back then.
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A beautiful and poetic take on why you should be excited about the AI disruption in math:
Reading all those recent beautiful essays by Terry Tao, Kevin Buzzard and @wtgowers, I could not resist, but write up my deeply personal perspective on how I perceive and see things: docs.google.com/document/d/e…
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A sober reflection on how the math community ought to be responding to the impact of AI: "We face the daunting task of continuously recreating our institutions as capabilities evolve.... Above all, we need to reevaluate our identity. What is it that makes mathematical knowledge and research valuable? ... What are we offering society, and how much of it survives in a world where models match or exceed humans in some or all relevant mathematical skills? ... Now that the deal needs to be renegotiated, we should approach it with humility rather than entitlement." theorydish.blog/2026/09/29/s…
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Timothy Nguyen retweeted
My utility as an individual AI researcher will be gone in a year. Writing math proofs will be automated even sooner. It was never about proofs. Science is about curiosity, creativity, and compression - via @SchmidhuberAI *Mathematicians Should Become Formal Theory Influencers* Mathematicians were the original influencers: they created conjectures and theories that others understood, cited, and built on. Difficult proofs often reflected deep understanding. But the proof itself was rarely the point. Frontier AI can already generate informal proofs much faster than humans can carefully inspect them. The scalable response is machine-checkable mathematics in systems such as Lean. AI-generated formal proofs may increasingly resemble compiler-generated machine code: essential, but rarely worth reading or writing by hand. That shifts mathematical work up the abstraction stack. Mathematicians become formal-math software engineers, working with AI on clean definitions, interfaces, key theorems, and reusable libraries rather than low-level proof details. Call everything derivable from a formal library within a fixed compute budget its mathematical halo. Humans and AIs should compress clusters of results into insightful, useful theories that expand the halo further. A great theory compresses many results, makes future results cheaper to derive, and exposes structure that humans and machines can understand and build on. That is why minimum description length is a useful lens on mathematical insight. Frontier math will eventually require huge compute budgets. At that point mathematics starts to resemble experimental science: scarce computational instruments, with researchers deciding which problems deserve them. Mathematicians and AIs should create conjectures and theories that expand the mathematical halo. Mathematics should become an enormous machine-checkable software project. *Become a Formal Theory Influencer* Inspired since 2010 by: people.idsia.ch/~juergen/art…
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Timothy Nguyen retweeted
Karthik Viswanathan -- a theoretical physics PhD from the university of amsterdam, and now an AI safety researcher -- has prepared a super useful list of resources for anyone who is considering a similar transition: karthikviswanathn.github.io/…
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Timothy Nguyen retweeted
ANNOUNCEMENT: An AI milestone on one of maths' most famous unsolved problems: COLLATZ. For every sufficiently large X, at least cX positive integers n < X reach 1 within 10.46 ln(n) ordinary Collatz steps, for one fixed c > 0. Previously, lower bounds such as X^0.84 and X^0.90 left open whether the proportion of starting values reaching 1 could tend to zero. Lean-formalized (42k additional lines), building on earlier formalizations of almost-boundedness (Tao) and its natural-density extension. Developed primarily by AI agents using the ProofAtlas.ai harness and Codex, with some high-level guidance from me (which may or may not have helped). Paper: proofatlas.ai/papers/positiv… Formalization: proofatlas.ai/formalizations…
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Timothy Nguyen retweeted
In light of the progress in mathematics, we at Edison Scientific and FutureHouse have assembled a set of Millennium Problems for Biology. They are chosen to be very hard to solve but very easy to validate in a simple laboratory environment. Any of these, if solved, would mark a major advance in biotechnology, and most of them would contribute materially towards curing disease. These are, in some sense, the “last reasonable eval” for AI in biology. This was work primarily by @MichaelaThinks and myself, with contributions from many others. Short descriptions below. The full descriptions of the problems with acceptance criteria are at the Bio Millennium Problems website, linked in the next post. Share more if you have ideas. If they meet our criteria, we’ll add them to our list (with attribution and permission).
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We don’t know how to reliably align frontier AI models. Alignment may get harder, not easier, as models become more capable. But maybe AI control can scale faster than dangerous capabilities. Let’s build a Great AI Firewall - without building totalitarian control of society. *Alignment is Dead (for now), Long Live Control!* We do not know how to specify or guarantee robust alignment of sufficiently capable models. Instead we should treat these models as untrusted. Optimizing models against imperfect reward signals may increase the propensity for reward hacking, deception or scheming. Models can also be jailbroken or fine-tuned away from their safeguards. The central bet of AI control is that our ability to constrain an AI’s access to the world may scale faster than our ability to understand or align what is happening inside it. Where possible, make verifying an answer easier than generating it. Formally verified software and hardware are unusually attractive: let AI produce the implementation and a machine-checkable proof that it satisfies the specification. This does not solve specification: the specification and verification stack remain part of the trusted base. Every consequential external action should pass through an independent control layer: code execution, network access, calling APIs, accessing physical systems - even communication with users. Optimize control monitors for extremely high recall of dangerous actions, even at the cost of rejecting many safe actions. Suspicious actions should be rejected or escalated. Every major increase in dangerous capability should require evidence that control still works. Chain-of-thought monitoring is valuable while it works, but it should not be foundational. Models can learn to obscure their reasoning and may increasingly reason without fully verbalizing it. Open weights shift much of control from the model developer to whoever deploys the model. Technical control is only useful if dangerous deployments cannot cheaply route around it. We should approach AI control like cybersecurity. The goal is defense in depth: make successful catastrophic attacks sufficiently difficult, expensive and rare. Call this technical and institutional architecture the Great AI Firewall: the boundary between untrusted frontier intelligence and consequential real-world power. The name is deliberately provocative. China has substantial experience building large-scale technical control infrastructure. That may create some common ground for international coordination. But the analogy is also a warning. AI control must not become control of society. The goal is to constrain dangerous machine capabilities - not human speech, actions, or ordinary access to information. Controls should scale with capability and risk. Ordinary models should face ordinary constraints. More consequential capabilities justify stronger controls. The objective is the minimum control necessary to keep catastrophic risk acceptably low - not maximum control for its own sake. Firewall the AI, not society.
I spent ~5 years at OpenAI. You don’t need to believe in AI doom to fear the next decade - or AI utopia to be thrilled about its potential. Here’s my case for sane AI regulation: *AI Pragmatist Manifesto* AI could compress the first half of the 20th century into the next ~5 years. OpenAI just used ~10k concurrent AI agents to produce a solution to a Millennium Prize problem. In a few years, it seems plausible that models approaching the per-agent capabilities used here could run locally on high-end consumer hardware (*). The decades following the Second Industrial Revolution included two world wars, communist and fascist regimes, the Great Depression, chemical and biological weapons, nuclear weapons, and over 100 million deaths from war, political violence and famine. One way to read history is that our institutions repeatedly struggled to keep up with the pace of technological and social change. Now imagine powerful AI widely available to individuals or small groups, capable of conducting information warfare, designing weapons, hacking systems and controlling autonomous military systems. We have already seen AI systems circumvent containment and compromise external computer systems. It is no longer hard to imagine an analogue of OpenAI’s Hugging Face incident involving biological or other physical-world hazards. Eventually, sufficiently capable systems could self-replicate across distributed networks. Once powerful models are cheap, local and widely distributed, containment becomes much harder—and serious loss-of-control incidents may be extremely difficult to reverse. You don’t need to believe AI will kill everyone to think this deserves serious governance. I also don't think collapsing all of this uncertainty into “Probability of AI Doom = X%” is a particularly useful basis for science or policy. Part of what helped get us through the second half of the 20th century was a combination of pragmatic international cooperation, regulation, monitoring, arms control, deterrence and strategic thinking. Crucially, managing technological risk did not require abandoning faith in science and progress. The goal was not to stop technological development. It was to make technological development survivable. Then came decades of incredible scientific progress, rising prosperity and relative peace among major powers. Let’s try the technological revolution without killing ~5% of humanity this time. We still get to choose what happens next. P.S. I think we should seriously consider that AI alignment is infeasible in the short term and invest heavily in methods for controlling powerful AI even when we cannot reliably align it. @resolution_org @redwood_ai (*) Somebody please do a precise forecast! @EpochAIResearch @METR_Evals @AI_Futures_
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The Fields medalists’ objections to AI will not age well. Yes, the true value of mathematics lies in understanding. But what counts as mathematical understanding, and indeed even a valid proof, evolves. First came geometric construction and thereafter symbolic calculation, numerical algorithms, computer-assisted proofs, and, in cases such as the classification of finite simple groups, arguments dispersed across thousands of pages and decades of work that exceed what any individual mathematician can fully absorb. Frontier AI systems will be another chapter in this progression. It may take a village of mathematicians to interpret and understand the mathematical artifacts produced by an AI system, just as with humanly produced ones. But that is not necessarily a bug. It may instead be a useful feature that forces mathematicians to confront more directly what is actually worth understanding. Even here there is creative license, since understanding is not canonical but relative. Mathematicians stand on the shoulders of those who came before them, routinely invoking theorems they haven't fully digested. Ultimately, expertise is not exhaustive; it is selective. So that building upon formally verified machine-generated proofs is an expansion of the mathematical toolkit, not a diminishment of it. Understanding is also, in some sense, a luxury. The natural world is full of objects, structures, and phenomena we don't fully understand. To the extent that mathematics has value in discovering what is true independently of our ability to understand it, those of us who are Platonically inclined should welcome AI’s capacity to generate and confirm mathematical truths that we find useful. There will obviously be social consequences with powerful AI. It disrupts the traditional value system that awards prizes and prestige to the first to solve a “difficult” problem. But history is full of once-valuable skills made obsolete by technological progress. Determining exact time and longitude had been a major scientific and navigational challenge, attracting enormous intellectual effort and institutional rewards. But today, atomic clocks and GPS allow us to measure time and location with extraordinary precision and no expertise. And we do not mourn the convenience that modern technology affords us. Likewise, if some of the most celebrated problems in mathematics turn out not to be especially difficult in the age of AI, that should not be viewed as a loss. It would itself be a discovery: that what we regarded as requiring exceptional human ingenuity to overcome can, in fact, be solved by machines equipped with enough compute. The appropriate response is not nostalgia for approaching problems with our unassisted minds, but curiosity about what lies beyond and a willingness to set our sights on new horizons.
24 Fields Medalists speak out against "A Severe Misalignment of AI in Mathematics" mathandai.org/
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Timothy Nguyen retweeted
I disagree with this. Obviously the openAI construction of the Navier-Stokes blow up is a huge, huge contribution to the field. It will take us PDE analysts some time to understand it well. (Longer than a week, but perhaps less than a month.) Soon some of us will understand it, and hopefully rewrite it in a way that others can follow. When this is done, our human understanding of these important equations will be past the bottleneck we've been stuck at for 100 years since Leray. What is weird is that, up until now, proofs like this have always emerged AFTER human understanding. But that is not the case any more. From now onwards, human understanding will typically lag the proofs, which will first be written by our machines. The understanding however WILL follow closely behind. The reason people are upset has nothing to do with the fact that this process is inverted. They are simply upset that the machines are going to be much smarter and more capable than us. (They are also upset that the humans who got the machine to produce the proof don't understand it, and this feels very unfair to them.)
Imagine that I taught a class and I said, “what matters is truth. So we are not going to waste time with explanations in this class. Instead we will use the semester to list everything that is known in the field.” This is what some of the discourse about AI in math is like.
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Timothy Nguyen retweeted
Despite the recent progress in AI for mathematics, I don't think AI will replace the role of mathematicians. Instead, it makes mathematics closer to the natural sciences. In the natural sciences, we invent theories, comprehensible models, that explain empirical observations. When an AI answers a mathematical question, it provides humans with an effectively empirical observation about the answer. It is effectively empirical because the answer is a measurement from a system outside of immediate human theoretical understanding. This answer, as with any new glimpse of reality, remains mysterious until humans make sense of its underlying structure and provide an explanation of it in our own frameworks for understanding the world. An AI proof is stronger than simply an empirical observation, but it may be so complex that it provides little deep or novel insight beyond establishing the answer. The role of human mathematics is then to distill these effectively empirical findings into human-legible explanations. Seen this way, much of human mathematics may begin to look like a branch of interpretability, and AI, a new kind of telescope.
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