Lean 4.0.0, first official lean4 release

This page summarizes the projects mentioned and recommended in the original post on news.ycombinator.com

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  • mathlib4

    The math library of Lean 4

    Is Lean a Category?

    (like much debated: is Hask(ell) a Category)

    "In this section we set up the theory so that Lean's types and functions between them can be viewed as a `LargeCategory` in our framework."

    So it seems to be proven that there is a Category Lean!

    https://github.com/leanprover-community/mathlib4/blob/master...

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  • lean4

    Lean 4 programming language and theorem prover

  • logical_verification_2023

    Hitchhiker's Guide to Logical Verification (2023 Edition)

    Me too, I want to follow

    https://github.com/blanchette/logical_verification_2023

    The hitchhiker's guide

  • mathlib3

    Discontinued Lean 3's obsolete mathematical components library: please use mathlib4

    Kinda agree but Mathlib and its documentation makes for a big corpus to learn by example from. Not ideal but it helps.

    https://github.com/leanprover-community/mathlib

  • learnxinyminutes-docs

    Code documentation written as code! How novel and totally my idea!

  • lean4-mode

    Emacs major mode for Lean 4

  • topos

    Topos theory in lean (by b-mehta)

    Here's a Lean 3 development of a bunch of topos theory https://github.com/b-mehta/topos/tree/master/src , but it's not in the maths library (and now needs to be updated to Lean 4, although the community have had great success with that kind of project; one million lines of mathlib was translated from Lean 3 to Lean 4 using a combination of automation and human work)

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Did you konow that Lean is
the 77th most popular programming language
based on number of metions?