mathlib

45ce3929 - chore(linear_algebra/dimension): tidy lemma names for `linear_map.rank` (#18769)

chore(linear_algebra/dimension): tidy lemma names for `linear_map.rank` (#18769) `le1` and `le2` don't really fit the usual naming convention. Also generalizes `rank_le_domain` to rings and `rank_le_range` across universes.