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AI Crisis in Math: Navier-Stokes, Riemann Hypothesis & Complexity Theory | Lex Fridman Podcast #503

Ankur Moitra, Steven Brunton and Alex Kontorovich are three mathematicians who can speak to this incredible moment in the history of mathematics, when AI solved some of its hardest problems: Navier-Stokes, the quasi-Riemann hypothesis, the unique games conjecture and hundreds of other problems. Ankur Moitra is a mathematician at MIT (visiting the Institute for Advanced Study in Princeton) working in theoretical computer science, who can speak to the unique games conjecture, complexity theory and the mathematics of how AI learns. Steven Brunton is a mathematician and fluid dynamics expert at UW, who can speak to Navier-Stokes, turbulence and machine learning for fluid dynamics. Alex Kontorovich is a mathematician at Rutgers specializing in number theory, who can speak to the Riemann hypothesis, Lean and machine-checked proofs. Thank you for listening ❤ Check out our sponsors: https://lexfridman.com/sponsors/ep503-sb See below for timestamps, transcript, and to give feedback, submit questions, contact Lex, etc. *Transcript:* https://lexfridman.com/math-ai-crisis-transcript *CONTACT LEX:* *Feedback* - give feedback to Lex: https://lexfridman.com/survey *AMA* - submit questions, videos or call-in: https://lexfridman.com/ama *Hiring* - join our team: https://lexfridman.com/hiring *Other* - other ways to get in touch: https://lexfridman.com/contact *EPISODE LINKS:* Ankur's Website: https://people.csail.mit.edu/moitra/ Alex's X: https://x.com/AlexKontorovich Alex's Website: https://sites.math.rutgers.edu/~alexk/ Steven's X: https://x.com/eigensteve Steven's YouTube: https://youtube.com/@Eigensteve Steven's Website: https://eigensteve.com Lean: https://lean-lang.org/ *SPONSORS:* To support this podcast, check out our sponsors & get discounts: *Wispr Flow:* AI-powered voice dictation app. Go to https://lexfridman.com/s/wispr_flow-ep503-sb *Fin:* AI agent for customer service. Go to https://lexfridman.com/s/fin-ep503-sb *LMNT:* Zero-sugar electrolyte drink mix. Go to https://lexfridman.com/s/lmnt-ep503-sb *Blitzy:* AI agent for large enterprise codebases. Go to https://lexfridman.com/s/blitzy-ep503-sb *Shopify:* Sell stuff online. Go to https://lexfridman.com/s/shopify-ep503-sb *NetSuite:* Business management software. Go to https://lexfridman.com/s/netsuite-ep503-sb *Perplexity:* AI-powered answer engine. Go to https://lexfridman.com/s/perplexity-ep503-sb *OUTLINE:* 0:00 - Introduction 1:56 - Crisis moment in mathematics 10:13 - Will AI "solve" mathematics? 26:24 - Can AI create new math? 1:05:56 - Riemann hypothesis 1:29:49 - Navier-Stokes 1:55:45 - How nature computes 2:04:39 - Unique Games Conjecture and complexity theory 2:19:31 - How mathematicians think 2:33:08 - Is math invented or discovered? 2:39:16 - Can AI solve P vs NP? 2:49:31 - Why LLMs work so well 3:03:57 - Problems AI can't solve yet 3:08:27 - Grigori Perelman 3:17:45 - Advice for young people *PODCAST LINKS:* - Podcast Website: https://lexfridman.com/podcast - Apple Podcasts: https://apple.co/2lwqZIr - Spotify: https://open.spotify.com/show/2MAi0BvDc6GTFvKFPXnkCL - RSS: https://lexfridman.com/feed/podcast/ - Podcast Playlist: https://www.youtube.com/playlist?list=PLrAXtmErZgOdP_8GztsuKi9nrraNbKKp4 - Clips Channel: https://www.youtube.com/lexclips *SOCIAL LINKS:* - X: https://x.com/lexfridman - Instagram: https://instagram.com/lexfridman - TikTok: https://tiktok.com/@lexfridman - LinkedIn: https://linkedin.com/in/lexfridman - Facebook: https://facebook.com/lexfridman - Patreon: https://patreon.com/lexfridman - Telegram: https://t.me/lexfridman - Reddit: https://reddit.com/r/lexfridman

Lex FridmanhostAlex KontorovichguestAnkur MoitraguestSteven Bruntonguest
Oct 26, 20263h 34mWatch on YouTube ↗

At a glance

WHAT IT’S REALLY ABOUT

AI math breakthroughs spark anxiety, rethinking research, meaning, and institutions

  1. The conversation centers on the shock and uncertainty triggered by recent AI systems releasing claimed solutions to major math problems, and what this means for the future of mathematical research and culture.
  2. Speakers debate whether AI is merely recombining known techniques at unprecedented scale or creating genuinely new mathematical ideas, and how that shifts what humans should value in mathematics.
  3. They highlight institutional strain—journals, refereeing, and incentives—arguing that AI may force new collaborative models for verification, publication, and community understanding.
  4. The episode uses concrete cases—quasi-Riemann hypothesis progress, a forced Navier–Stokes blowup construction, and a proof of the Unique Games Conjecture—to illustrate both the promise and the disruption of AI-driven mathematics.
  5. Across topics, they return to a shared theme: mathematics’ deepest value lies in human understanding, stories, and asking the right questions, not only in accumulating solved theorems.

IDEAS WORTH REMEMBERING

5 ideas

A “solved math” future doesn’t necessarily kill mathematics’ human purpose.

He argues that even if AI eventually becomes good enough that any human+AI progress could have been achieved by AI alone, that doesn’t imply mathematics is destroyed—because the value of pure math isn’t just solutions stored in data centers, but understanding and insight living in human minds.

AI boosts mathematicians’ reach while making mentorship and career guidance harder.

He describes feeling simultaneously empowered (AI as a world-class tutor that boosts cross-field learning and connections) and worried (the old blueprint for how students build careers—incremental progress on famous problems—feels destabilized).

Theorem-proving is the visible task, not the whole role of a mathematician.

He uses the “doorman fallacy” to argue that reducing mathematicians’ value to “proving theorems” misses crucial parts of the job: building concepts, abstractions, explanations, and new ways of seeing—things that may become more valuable as theorem-proving becomes cheaper.

AI progress may be less about brand-new ideas and more about powerful composition at scale.

He describes AI solutions (e.g., quasi-RH) as chaining known human techniques in a long, surprising cascade; he rejects the dismissive “convex hull” framing and prefers viewing it as a much larger compositional space (a “semigroup”) of moves.

Knowing a result is true is not the same as learning why it’s true.

He emphasizes that math isn’t just theorems; it’s the ‘how’—the story, the fight with the problem, and the abstractions built along the way. He worries that instant AI solutions can eliminate the human journey that produces transferable understanding.

WORDS WORTH SAVING

5 quotes

I think we're entering, if, if we're not already in, a period of some kind of golden age of mathematical knowledge after, uh, millennia of having, uh, a candle that we are walking around the woods, and this is as far as we can see. Now we have a flashlight.

— Alex Kontorovich

So I feel very excited, but maybe more intellectually lonely than I felt before, uh, in part because, you know, a lot of times great results come from asking very humble questions, at least for me.

— Ankur Moitra

This is a really good opportunity for us to remember why we're doing this. Like, what is human purpose? It's not to be famous. It's not to have a Fields Medal.

— Steven Brunton

I don't think the value of pure mathematics is that it lives in the heads of human beings.

— Alex Kontorovich

It's always been the why. It's our deepest quest for understanding, and if you just tell me a fact is true, but I don't understand why it's true, that has contributed zero to my knowledge.

— Alex Kontorovich

AI “crisis moment” in mathematicsSolved axiom and centaur math analogyQuasi-Riemann hypothesis progress and zero-free regionsNavier–Stokes blowup, forcing, and 3D vortex stretchingUnique Games Conjecture, PCP theorem, hardness of approximationLean, Mathlib, autoformalization, proof verificationJournals, refereeing strain, and new collaboration models

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