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[Merged by Bors] - feat(analysis/inner_product_space/pi_L2): extend an indexed orthonormal set to an orthonormal basis #16478
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Thanks 🎉
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…al set to an orthonormal basis (#16478) Given a finite-dimensional inner product space `E`, a fintype `ι` whose cardinality is the dimension of `E`, and a function `v : ι → E` whose restriction to some set `s` in `ι` is orthonormal, modify `v` to give an orthonormal basis for `E` indexed by `ι` which agrees on `s` with `v`. We already have this lemma for sets (`orthonormal.exists_orthonormal_basis_extension`); this is just some messing round to get the indexed version. Also rename `orthonormal.coe_range` to `orthonormal.to_subtype_range`, matching the naming convention for `linear_independent.to_subtype_range`. Formalized as part of the Sphere Eversion project.
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feat(analysis/inner_product_space/pi_L2): extend an indexed orthonormal set to an orthonormal basis
[Merged by Bors] - feat(analysis/inner_product_space/pi_L2): extend an indexed orthonormal set to an orthonormal basis
Oct 4, 2022
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Given a finite-dimensional inner product space
E
, a fintypeι
whose cardinality is the dimension ofE
, and a functionv : ι → E
whose restriction to some sets
inι
is orthonormal, modifyv
to give an orthonormal basis forE
indexed byι
which agrees ons
withv
. We already have this lemma for sets (orthonormal.exists_orthonormal_basis_extension
); this is just some messing round to get the indexed version.Also rename
orthonormal.coe_range
toorthonormal.to_subtype_range
, matching the naming convention forlinear_independent.to_subtype_range
.Formalized as part of the Sphere Eversion project.