mathlib3

17a58072 - feat(category_theory/limits/fubini): another formulation for limits commuting (#4034)

feat(category_theory/limits/fubini): another formulation for limits commuting (#4034) The statement that you can swap limits, rather than just combine into a single limit as we had before. (This just uses two copies of the previous isomorphism.) Co-authored-by: Scott Morrison <scott.morrison@gmail.com>