Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2022-05-24 10:24 65f1f8e2

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feat(linear_algebra/quadratic_form/isometry): extract from linear_algebra/quadratic_form/basic (#14305) 150 lines seems worthy of its own file, especially if this grows fun_like boilerplate in future. No lemmas have been renamed or proofs changed.

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