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Commit 2020-08-24 01:00 f2304096

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feat(category_theory/adjunction): opposite adjunctions (#3899) Add two constructions for adjoints for opposite functors.

Estimated changes

Created src/category_theory/adjunction/opposites.lean

added def adjunction.adjoint_of_op_adjoint_op

added def adjunction.adjoint_of_unop_adjoint_unop

added def adjunction.adjoint_op_of_adjoint_unop

added def adjunction.adjoint_unop_of_adjoint_op

added def adjunction.op_adjoint_of_unop_adjoint

added def adjunction.op_adjoint_op_of_adjoint

added def adjunction.unop_adjoint_of_op_adjoint

added def adjunction.unop_adjoint_unop_of_adjoint

Modified src/category_theory/opposites.lean

added def category_theory.op_equiv

added theorem category_theory.op_equiv_apply

added theorem category_theory.op_equiv_symm_apply