Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2022-01-18 09:14 f23c00f2

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chore(algebra/order/ring): move lemmas about invertible into a new file (#11511) The motivation here is to eventually be able to use the one_pow lemma in algebra.group.units. This is one very small step in that direction.

Estimated changes

added theorem inv_of_le_one
added theorem inv_of_lt_zero
added theorem inv_of_nonneg
added theorem inv_of_nonpos
added theorem inv_of_pos
deleted theorem inv_of_le_one
deleted theorem inv_of_lt_zero
deleted theorem inv_of_nonneg
deleted theorem inv_of_nonpos
deleted theorem inv_of_pos