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Commit 2023-04-28 17:05 84771a9f

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feat(algebra/group/basic): a * b ≠ b ↔ a ≠ 1 (#18635) A few convenient corollaries of existing lemmas and a / 2 ≤ a ↔ 0 ≤ a.

Estimated changes

deleted theorem div_two_lt_of_pos
deleted theorem half_le_self
added theorem half_le_self_iff
deleted theorem half_lt_self
added theorem half_lt_self_iff