Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2020-06-26 16:35 2d270ff1

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feat(data/set/basic): +2 lemmas, +2 simp attrs (#3182)

Estimated changes

Modified src/data/set/basic.lean

added theorem set.image_diff

added theorem set.subset_image_diff

added theorem subtype.image_preimage_coe

modified theorem subtype.image_preimage_val