Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2020-11-23 01:00 ce0498e6

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feat(data/nat/basic): add injectivity and divisibility lemmas (#5068) Multiplication by a non-zero natural is injective. Also a simple criterion for non-divisibility which I couldn't find (0<b<a implies a doesn't divide b).

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