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> When I last looked into Lean, I was highly unimpressed, even for doing math proofs.

I remember exploring different proof assistants for the first time in the 2000s. Back then, only people with a background in logic were involved, and most of the proofs that were formalized as showcases were of textbook results from the 19th century at most, or some combinatorial stuff like the four-color theorem.

I believe Voevodsky was one of the first prominent non-logicians to become interested in proof assistants, using Coq around 2010. Nowadays, several mathematicians coming from algebraic geometry, number theory, etc. are promoting formal proofs, and it seems like most of them have chosen Lean. I don't know whether this is because Lean is somehow better suited for working mathematicians, or if it was simply a random personal preference among people who got enthusiastic about this stuff and started advertising it to their colleagues?

I am not familiar with every proof assistant out there, but many of them are a very hard sell for mathematicians and lack a comprehensive math library. Lean seems to be one of the few exceptions.



Isabelle also has a fairly large set of mathematical proofs and supporting libraries, see https://www.isa-afp.org.

People routinely publish new proofs there, it is actually a regular referred journal.




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