Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2021-03-02 19:27 0c863e98

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refactor(data/set/finite): change type of set.finite.dependent_image (#6475) The old lemma combined a statement similar to set.finite.image with set.finite.subset. The new statement is a direct generalization of set.finite.image.

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