Hi all, obviously on natural numbers ‹{0..<n} = {..<n}› holds, and the right hand side is also more convenient to work with (no preconditions on m being less or equal n etc.). But for historic reasons, ‹{0..<n}› is still the preferred variant in many theorems, cf. ‹find_theorems "{0::nat..<_}"›. I'm tempted to say that these occurrences should be normalized to ‹{..<n}› and ‹{0..<n} = {..<n}› be added as default simp rule, but I leave it to experts on intervals to judge. Cheers, Florian
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