Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2019-10-24 21:13 9db43a5f

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chore(data/nat/basic): remove pos_iff_ne_zero' (#1610) This used to be different from pos_iff_ne_zero because the latter was phrased in terms of n > 0, not 0 < n. Since #1436 they are the same.

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