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Commit 2021-03-16 16:06 ffacd120

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feat(algebra/iterate_hom): add equiv.perm.coe_pow (#6698) Also rewrite equiv.perm.perm_group in a more explicit manner.

Estimated changes

added theorem equiv.perm.coe_pow
added theorem hom_coe_pow
added theorem monoid_hom.coe_pow
modified theorem ring_hom.coe_pow