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Commit 2021-08-25 06:39 26a32863

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fix(data/set/lattice): lemmas about Union/Inter over p : Prop (#8860) With recently added @[congr] lemmas, it suffices to deal with unions/inters over true and false.

Estimated changes

added theorem set.Infi_eq_dif
added theorem set.Inter_eq_if
added theorem set.Union_eq_dif
added theorem set.Union_eq_if
deleted theorem set.Union_prop
deleted theorem set.Union_prop_neg
deleted theorem set.Union_prop_pos