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Commit 2021-03-05 21:45 4bc67070

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feat(topology/local_homeomorph): preimage of closure and frontier (#6547)

Estimated changes

Modified src/topology/local_homeomorph.lean

added theorem local_homeomorph.image_inter_source_eq'

added theorem local_homeomorph.map_nhds_within_eq

added theorem local_homeomorph.preimage_closure

added theorem local_homeomorph.preimage_frontier