Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2019-08-12 15:28 92a54240

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feat(data/fin): mem_find_iff (#1307)

feat(data/fin): mem_find_iff
add find_eq_some_iff (#1308)

Estimated changes

Modified src/data/fin.lean

added theorem fin.find_eq_some_iff

added theorem fin.mem_find_iff