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  1. OK, so now item 24 on this list of 100 theorems has an *unconditional* formal proof: You can read about it in this paper:

  2. Jan 13

    I'm teaching algebraic geometry this term. Today is lecture one and I'm going to talk about why the union of two algebraic sets is an algebraic set. I'm formalising the proof in ! My Lean repository is hosted on github at

  3. 1 Nov 2019

    repeat {rw pow_zero}, ring, The natural number game.

  4. 1 Mar 2019

    Futuristic Mathematics: Computer-based Theorem Verification, Computer-based proof assistance: (great overview with many useful links and context!)

  5. Jan 25
  6. Jan 6

    I've finished updating Lean for Hackers for tonight: Follow along and you'll learn how to setup Lean and dive right into "Hello, world!" and "Hello, ${name}". This is a guide for hackers so I skip the theory and get straight to it.

  7. 2 Nov 2019
  8. 5 Sep 2019

    I watched Kevin Buzzard talking about LEAN and CoCalc today at Microsoft Research.

  9. Jan 21

    In my alg geom course I prove V(I(V(S)))=V(S), for S a subset of k[X_1,X_2,...,X_n] and V and I the usual functions in the theory of affine alg varieties. I abstracted it and turned it into a new Lean maths challenge

  10. Flypitch project paper, accepted to CPP (Certified Programs and Proofs) 2020

  11. 4 Nov 2019
    Replying to

    > Who among us has never been wrong about something “obvious”?

  12. Jan 9

    Updated the hackers' guide to Lean with a guessing game example:

  13. 9 Dec 2019

    Asked by : if you could take a sabbatical just to formalize (say in ) the basics of any field of math, which would it be and why?

  14. French pop-science article about the efforts of Woodin towards a resolution of the CH h/t Patrick Massot in the chat.

  15. 2 Nov 2019
    Replying to

    Come and talk about it on the natural number game thread in the new members stream at the chat at Zulip . Someone there will be able to tell what is and isn't easy right now.

  16. 4 Nov 2019

    A formal proof of PAC learnability for decision stumps. ~ J. Tassarotti, J.B. Tristan, K. Vajjha.

  17. 21 Jul 2019

    Xena project: formalising math starting from the undergrad curriculum.

  18. 30 Apr 2019

    Worked a bit tonight on adding an FFI into the community Lean fork.

  19. Jan 20

    Tabled typeclass resolution. ~ D. Selsam, S. Ullrich, L. de Moura.

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