Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2020-10-19 15:37 a1f17706

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Revert "chore(data/multiset): add a few lemmas" This reverts commit 45caa4f392fe4f7622fef576cf3811b9ff6fd307.

Estimated changes

Modified src/data/multiset/basic.lean

deleted theorem multiset.count_cons

deleted theorem multiset.map_nsmul

deleted theorem multiset.sum_map_singleton