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Commit 2022-03-15 15:20 375419f9

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feat(algebra/algebra/subalgebra/pointwise): lemmas about * and to_submodule (#12695)

Estimated changes

Modified src/algebra/algebra/subalgebra/pointwise.lean

modified theorem subalgebra.mul_self

added theorem subalgebra.mul_to_submodule

added theorem subalgebra.mul_to_submodule_le