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Commit 2021-03-17 22:49 30b34552

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feat(ring_theory/roots_of_unity): Restrict ring homomorphism to roots of unity (#6646) Restrict a ring homomorphism to roots of unity.

Estimated changes

Modified src/ring_theory/roots_of_unity.lean

added def ring_equiv.restrict_roots_of_unity

added theorem ring_equiv.restrict_roots_of_unity_coe_apply

added theorem ring_equiv.restrict_roots_of_unity_symm

added theorem ring_hom.map_root_of_unity_eq_pow_self

added def ring_hom.restrict_roots_of_unity

added theorem ring_hom.restrict_roots_of_unity_coe_apply

added theorem roots_of_unity.coe_pow