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Commit 2020-05-26 16:47 4ca776ee

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feat(linear_algebra/quadratic_form): equivalence of quadratic forms (#2769)

Estimated changes

Modified src/linear_algebra/quadratic_form.lean

added theorem quadratic_form.equivalent.refl

added theorem quadratic_form.equivalent.symm

added theorem quadratic_form.equivalent.trans

added def quadratic_form.equivalent

added theorem quadratic_form.isometry.map_app

added def quadratic_form.isometry.refl

added def quadratic_form.isometry.symm

added def quadratic_form.isometry.trans

added structure quadratic_form.isometry