[ux266478]

What semantics do you use for your HOL library? I scanned around but documentation on that page is a bit sparse. The github repo goes to a random user's page, and all I could find there was this unrelated repo: https://github.com/digama0/HOL

[xelxebar]

Yeah, that github URL should be fixed. The HOL database is here https://github.com/metamath/set.mm/blob/develop/hol.mm

[TheGoddessInari]

Reading `hol.mm` made me grateful for Lean 4's general purpose programming.

I get the string substitution focus, and respect what metamath has achieved, but the bridge Lean 4 makes wrt systems programming has left quite an impression.

I wonder how many people mostly see mathlib4 & think that's the one prescribed route (ala Rust) when one of Lean 4's under-documented super powers is the ease with which you can roll your own light-weight low to zero overhead domain-specialized constructs that are also trivial to prove because of the dependent type system.

(Perhaps more for verified functional systems than deep math.)