Commit 2021-03-31 13:16 f29b0b49

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feat(category_theory/lifting_properties): create a new file about lifting properties (#6852) This file introduces lifting properties, establishes a few basic properties, and constructs a subcategory spanned by morphisms having a right lifting property.

Estimated changes

Modified src/category_theory/arrow.lean

added theorem category_theory.arrow.square_from_iso_invert

added theorem category_theory.arrow.square_to_iso_invert

added def category_theory.arrow.square_to_snd

added theorem category_theory.arrow.w_mk_right

Created src/category_theory/lifting_properties.lean

added theorem category_theory.has_right_lifting_property_comp'

added theorem category_theory.has_right_lifting_property_comp

added theorem category_theory.id_has_right_lifting_property'

added theorem category_theory.id_has_right_lifting_property

added theorem category_theory.iso_has_right_lifting_property

added theorem category_theory.right_lifting_property_initial_iff

added def category_theory.right_lifting_subcat.X

added def category_theory.right_lifting_subcat

added def category_theory.right_lifting_subcategory

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