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by lispm 1110 days ago
ML was written as the language used by the theorem prover LCF. It was written in Lisp.
1 comments

I didn't know that link, searches seem to confirm. Thank you.

The LCF style provers rely on the host language type system. A theorem instance can only be created by the trusted kernel. Lisp doesn't obviously lend itself to that - you could represent the proof, but I'm not clear how you'd prevent forging one.