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Theorem is_open_set_pi

Modification history

2022-09-20 14:59
src/topology/constructions.lean
chore(topology/constructions): use `variables` (#16562) …
Modified is_open_set_piView on Github →
2018-09-21 17:46
analysis/topology/continuity.lean
feat(analysis/topology): pi-spaces: topolopgy generation, prove second countability
Added is_open_set_piView on Github →