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Commit 2022-03-24 05:18 ec434b75

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feat(group_theory/order_of_element): finite orderness is closed under mul (#12750)

Estimated changes

Modified src/group_theory/order_of_element.lean

added theorem commute.is_of_fin_order_mul

added theorem is_of_fin_order.inv

added theorem is_of_fin_order.mul

deleted theorem is_of_fin_order_inv

added theorem order_of_pos_iff