mathlib

3fb9823d - feat(topology/subset_properties): variant of elim_nhds_subcover for compact_space (#7304)

feat(topology/subset_properties): variant of elim_nhds_subcover for compact_space (#7304) I put this in the `compact_space` namespace, although dot notation won't work so if preferred I can move it back to `_root_`. Co-authored-by: Scott Morrison <scott.morrison@gmail.com>