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Commit 2019-01-28 20:11 d1b7d914

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feat(category_theory/limits/cones): forgetful functors

Estimated changes

Modified src/category_theory/limits/cones.lean

added def category_theory.limits.cocones.forget

added theorem category_theory.limits.cocones.forget_map

added theorem category_theory.limits.cocones.forget_obj

added def category_theory.limits.cones.forget

added theorem category_theory.limits.cones.forget_map

added theorem category_theory.limits.cones.forget_obj