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Commit 2021-09-21 09:53 b5a6422f

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feat(data/finset): add lemmas (#9209)

  • add finset.image_id', a version of finset.image_id using λ x, x instead of id;
  • add some lemmas about finset.bUnion, finset.sup, and finset.sup'.

Estimated changes

added theorem finset.inf'_bUnion
added theorem finset.inf'_congr
added theorem finset.inf_bUnion
added theorem finset.inf_const
added theorem finset.sup'_bUnion
added theorem finset.sup'_congr
added theorem finset.sup_bUnion