Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2020-12-17 16:32 35f2789c

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chore(algebra/module/basic): add subsingleton (semimodule ℕ M) (#5396) This can be used to resolve diamonds between different semimodule ℕ instances. The implementation is copied from the subsingleton (module ℤ M) instance.

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