Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2023-04-04 11:37 be2ac64b

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chore(linear_algebra/dimension): rename rank to linear_map.rank (#18734) It's a bit weird having rank in the root namespace, defined in terms of module.rank which isn't. This moves all the lemmas into a single block at the end of the file, as they were previously spread through the file.

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