Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2020-10-19 04:45 4b890a24

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feat(*): make int.nonneg irreducible (#4601) In #4474, int.lt was made irreducible. We make int.nonneg irreducible, which is stronger as int.lt is expressed in terms of int.nonneg.

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