[Merged by Bors] - feat(CategoryTheory/CommSq): add basic CommSq lemmas #12033
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I'm also open to changing the names of these. I was trying to copy |
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Thanks! bors merge |
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Add basic lemmas about CommSq: - Compositions of commutative squares are commutative - If the horizontal arrows of a commutative square are isomorphisms, then flipping these arrows also yields a commutative square.
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Add basic lemmas about CommSq: - Compositions of commutative squares are commutative - If the horizontal arrows of a commutative square are isomorphisms, then flipping these arrows also yields a commutative square.
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Add basic lemmas about CommSq: - Compositions of commutative squares are commutative - If the horizontal arrows of a commutative square are isomorphisms, then flipping these arrows also yields a commutative square.
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Add basic lemmas about CommSq: - Compositions of commutative squares are commutative - If the horizontal arrows of a commutative square are isomorphisms, then flipping these arrows also yields a commutative square.
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Add basic lemmas about CommSq: - Compositions of commutative squares are commutative - If the horizontal arrows of a commutative square are isomorphisms, then flipping these arrows also yields a commutative square.
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Add basic lemmas about CommSq: