FWIW, not having done a proof since about 1982, it doesn't help me either.

~~Nice addition of a link that doesn't exist in the actual "quoted" source. If it did exist it would certainly be helpful though, so thanks for adding it I guess.~~

EDIT: Apparently their website design is just so poor their clickable links are identical to the non-clickable plain text. That link is a clickable word if you completely guess you can click on some of the apparent plain text.

Lean is a currently-niche programming language / proof-assistant. A proof assistant is basically a tool to construct mathematical proofs, which verifies that the proofs are correct like how a compiler verifies types in your programs.

IIUC a regular programming language with a certain set of restrictions already duals as a proof-assistant as discovered by Curry & Howard. By restrictions, I mean something like how Rust forces you to follow certain rules compared to Java.

Background about the organization: https://en.m.wikipedia.org/wiki/Convergent_Research

Their proof assistant / programming language: https://en.m.wikipedia.org/wiki/Lean_(proof_assistant)

There are a lot of broken links in the docs. Like most of the feature links.

There's a completely new language reference in the process of being written: https://lean-lang.org/doc/reference/latest/ (by David Thrane Christiansen, co-author of The Little Typer, and Lean FRO member)

Some links here seem to be broken at the moment — and David's currently on vacation so they likely won't be fixed until January — but if you see for example https://lean-lang.org/basic-types/strings/ it's supposed to be https://lean-lang.org/doc/reference/latest/basic-types/strin...

That answers the Lean part, FRO stands for Focused Research Organization

That doesn't say much.. Research on what? It looks like Lean is a programming language but everything else is pretty abstract to me.

"we aim to tackle the challenges of scalability, usability, and proof (Mathematics) automation in the Lean proof assistant."