Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2019-06-25 13:00 a2aeabbb

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feat(data/finset): length_sort (#1150)

Estimated changes

Modified src/data/finset.lean

added theorem finset.length_sort

Modified src/data/list/sort.lean

added theorem list.length_merge_sort

Modified src/data/multiset.lean

added theorem multiset.length_sort