Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2021-08-09 15:47 847fc12d

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feat(algebra): submodule.restrict_scalars p R is S-isomorphic to p (#8567) To be more precise, turning p : submodule S M into an R-submodule gives the same module structure as turning it into a type and adding a module structure.

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