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Theorem is_subring_Union_of_directed

Modification history

2020-08-26 14:45

src/deprecated/subring.lean

feat(ring_theory/bundled_subring): add bundled subrings (#3886)

Modified is_subring_Union_of_directed View on Github →

2019-04-07 16:29

src/ring_theory/subring.lean

feat(subgroup, subring, subfield): directed Unions of subrings are subrings (#889)

Added is_subring_Union_of_directed View on Github →