Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2020-08-15 19:14 8ce00af6

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feat(data/set/basic): pairwise_on for equality (#3802) Add another lemma about pairwise_on: if and only if f takes pairwise equal values on s, there is some value it takes everywhere on s. This arose from discussion in #3693.

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