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Garlef 9 days ago

I think Double Categories [1] would be a more appropriate setting: In a double category, the vertical and horizontal arrows are of different types. In usual commutative diagrams, they are of the same type.

[1]: https://ncatlab.org/nlab/show/double+category

noqc 9 days ago

Commutative diagrams are to these squares what category theory is to analogy.

ogogmad 9 days ago

There's a mapping there, however it's not natural.

gowld 9 days ago

noqc, can you diagram your comment?

ogogmad 9 days ago

Why don't some phrases arrive at the same meaning? They don't commute.