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Commit 2021-12-13 09:36 779517b6

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feat(algebra/order/floor): Floor of a / n and other lemmas (#10748) A few floor lemmas + one tsub lemma

Estimated changes

added theorem int.floor_le_ceil
added theorem nat.floor_div_eq_div
added theorem nat.floor_div_nat
added theorem nat.floor_le_ceil
added theorem nat.floor_sub_nat
added theorem tsub_nonpos