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Theorem submonoid.nontrivial_iff

Modification history

2021-08-17 16:30
src/group_theory/submonoid/basic.lean
chore(*): flip various `subsingleton_iff`, `nontrivial_iff` lemmas and add `simp` (#8703)
Modified submonoid.nontrivial_iffView on Github →
2021-01-12 16:10
src/group_theory/submonoid/basic.lean
feat(submonoid/basic): subsingleton and nontrivial instances for {add_,}submonoid (#5690)
Added submonoid.nontrivial_iffView on Github →