Lean 4 fork for HoTT-compatible kernel extensions (Path types, transport, HITs). Maintained against upstream leanprover/lean4.
5fda4c1023
This PR adds `simp` lemmas for `toInt_*` and `toNat_*` with arithmetic operation given the hypothesis of no-overflow (`toNat_add_of_not_uaddOverflow`, `toInt_add_of_not_saddOverflow`, `toNat_sub_of_not_usubOverflow`, `toInt_sub_of_not_ssubOverflow`, `toInt_neg_of_not_negOverflow`, `toNat_mul_of_not_umulOverflow`, `toInt_mul_of_not_smulOverflow`). In particular, these are `simp` since (1) the `rhs` is strictly simpler than the `lhs` and (2) this version is also simpler than the standard operation when the hypothesis is available. co-authored by @tobiasgrosser --------- Co-authored-by: Henrik Böving <hargonix@gmail.com> |
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