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Theorem is_subgroup_Union_of_directed

Modification history

2020-06-01 23:39
src/deprecated/subgroup.lean
chore(group_theory/sub*): move unbundled submonoids and subgroups to `deprecated` (#2912) …
Modified is_subgroup_Union_of_directedView on Github →
2019-04-07 16:29
src/group_theory/subgroup.lean
feat(subgroup, subring, subfield): directed Unions of subrings are subrings (#889)
Added is_subgroup_Union_of_directedView on Github →