Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2022-08-21 06:57 972aa423

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refactor(data/int/cast): Use hom classes (#16024) Restate map_eq_zero, map_ne_zero, map_int_cast, eq_int_cast' using monoid_with_zero_hom_class/ring_hom_class instead of monoid_with_zero_hom/ring_hom.

Estimated changes

added theorem eq_int_cast'
added theorem eq_int_cast
added theorem ext_int'
modified theorem int.cast_id
added theorem map_int_cast
modified theorem pi.coe_int
modified theorem pi.int_apply
modified theorem ring_hom.eq_int_cast'
deleted theorem ring_hom.eq_int_cast
deleted theorem ring_hom.map_int_cast