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Commit 2020-11-03 15:50 b26fc59f

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feat(category_theory/limits/shapes/products): pi comparison morphism (#4855)

Estimated changes

Modified src/category_theory/limits/shapes/products.lean

added theorem category_theory.limits.map_lift_pi_comparison

added def category_theory.limits.pi_comparison

added theorem category_theory.limits.pi_comparison_comp_π

added def category_theory.limits.sigma_comparison

added theorem category_theory.limits.sigma_comparison_map_desc

added theorem category_theory.limits.ι_comp_sigma_comparison