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Commit 2021-05-20 02:00 641cece5

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feat(algebra/homology): the homotopy category (#7484)

Estimated changes

Created src/algebra/homology/homotopy_category.lean

added def category_theory.functor.map_homotopy_category

added def category_theory.nat_trans.map_homotopy_category

added theorem category_theory.nat_trans.map_homotopy_category_comp

added theorem category_theory.nat_trans.map_homotopy_category_id

added def homotopic

added theorem homotopy_category.eq_of_homotopy

added def homotopy_category.homology_factors

added theorem homotopy_category.homology_factors_hom_app

added theorem homotopy_category.homology_factors_inv_app

added def homotopy_category.homology_functor

added theorem homotopy_category.homology_functor_map_factors

added def homotopy_category.homotopy_equiv_of_iso

added def homotopy_category.homotopy_of_eq

added def homotopy_category.homotopy_out_map

added def homotopy_category.iso_of_homotopy_equiv

added def homotopy_category.quotient

added theorem homotopy_category.quotient_map_out

added theorem homotopy_category.quotient_map_out_comp_out

added theorem homotopy_category.quotient_obj_as

added def homotopy_category