Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2021-05-06 06:18 9154a830

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feat(algebra/*, ring_theory/valuation/basic): linear_ordered_add_comm_group_with_top, add_valuation.map_sub (#7452) Defines linear_ordered_add_comm_group_with_top Uses that to port a few more facts about valuations to add_valuations.

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