Lean 4 fork for HoTT-compatible kernel extensions (Path types, transport, HITs). Maintained against upstream leanprover/lean4.
273b7540b2
This adds a simplification lemma for `(x - y).toNat` when the subtraction is known to not overflow (i.e., `y ≤ x`). We make a new section for this for two reasons: 1. Definitions of subtraction occur before the definition of `BitVec.le_def`, so we cannot directly place this lemma at `sub`. 2. There are other theorems of this kind, for addition and multiplication, which can morally live in the same section. |
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| CONTRIBUTING.md | ||
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