[Merged by Bors] - feat(linear_algebra/quadratic_form/basic): algebraic lemmas about bilin_form.to_quadratic_form
#16616
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…quadratic_form Following the usual pattern, we defined the bundled additive morphism so that we can copy across the salient lemmas about sums.
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…lin_form.to_quadratic_form` (#16616) Following the usual pattern, we defined the bundle additive morphism so that we can copy across the salient lemmas about sums. The `polar_to_quadratic_form` lemma in the diff was an existing lemma that has just been moved below the new `semiring` section.
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Following the usual pattern, we defined the bundle additive morphism so that we can copy across the salient lemmas about sums.
The
polar_to_quadratic_formlemma in the diff was an existing lemma that has just been moved below the newsemiringsection.