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Commit 2021-07-18 22:22 ee607111

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feat(data/finset/basic): product, bUnion, sdiff lemmas (#8321)

Estimated changes

Modified src/data/finset/basic.lean

added theorem finset.bUnion_bUnion

added theorem finset.bUnion_subset_iff_forall_subset

added theorem finset.product_bUnion

added theorem finset.sdiff_ssubset

Modified src/order/boolean_algebra.lean

added theorem sdiff_lt