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Theorem set.ssubset_iff_subset_not_subset

Modification history

2020-01-09 22:58
src/data/set/basic.lean
refactor(data/set/basic): change def of `⊂` to match `<` (#1862)
Deleted set.ssubset_iff_subset_not_subsetView on Github →
2018-08-10 09:04
data/set/basic.lean
feat(data/set/finite): card_image_of_injective and other minor lemmas (#245)
Added set.ssubset_iff_subset_not_subsetView on Github →