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Lean 4 is the latest major version of the Lean theorem prover by Microsoft Research. Use this tag for questions specific to Lean 4; if it's about Lean in general, use the tag (lean).

1 vote
Accepted

Automatic nightly Lean update?

If you would like to change to the current nightly, then you can change the contents of lean-toolchain to, e.g. leanprover/lean4:nightly-2023-09-23 However! …
Kim Liesinger's user avatar
8 votes
Accepted

What are the goals of Lean 4?

There are many aspects to this: It's faster (e.g. the ~80% portion of mathlib that has been ported so far compiles between 3 and 4 times faster than it did under Lean 3.) The metaprogramming framewor …
Kim Liesinger's user avatar
6 votes
Accepted

Aesop Tactic in Lean

SimpleGraph is a definition of a "simple graph" in the mathlib4 library. The API for SimpleGraph uses aesop to help automate some common proof steps. I'm guessing from your question that you've notice …
Kim Liesinger's user avatar