Lean 4 fork for HoTT-compatible kernel extensions (Path types, transport, HITs). Maintained against upstream leanprover/lean4.
958ad2b54b
Step 3/~7 in upstreaming LeanSAT. A few thoughts: - Why is this not in `Std.Sat`? LeanSAT's bitblaster operates on a limited internal language. For example it has no idea that signed comparision operators even exist. This is because it relies on a normalization pass before being given the goal. For this reason I would not classify the bitblaster as an API that we should publicly advertise at this abstraction level - Sometimes I slightly rebuild parts of the LawfulOperator infrastructure for operators that work non-tail-recursively. This is because they do not return an `Entrypoint` but instead an `ExtendingEntrypoint` in order to even be defined in the first place (casting Ref's and all that). Given the fact that this barely happens and I never actually commit to rebuilding the full API I'm hoping that this is indeed a fine decision? - The single explicit `decreasing_by` that has a simp only which *almost* looks like `simp_wf` is missing a singular lemma from `simp_wf` because it doesn't terminate otherwise. - I am not using functional induction because it basically always fails at some generalization step, that is also the reason that there is lots of explicit `generalize` and manually recursive proofs. --------- Co-authored-by: Markus Himmel <markus@lean-fro.org> Co-authored-by: Tobias Grosser <tobias@grosser.es> |
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