List questions from orthonormal | MathQA

Unitary operator between two orthonormal basis'

Published on 29 Dec 2022 - 22:57

Orthonormal basis in a space with an isotropic inner product

Published on 26 Mar 2026 - 14:20

In a 3D corner defined by vectors A and B and their normal N, how can B be obtained from A and N?

Published on 09 Jan 2023 - 18:47

How can I prove that $\sum_{k=1}^n \langle x,e_k\rangle e_k$ in a Hilbert space does not converge in norm?

Published on 11 Jan 2023 - 14:57

A system of three `eigenequations' (sort of)

Published on 13 Jan 2023 - 13:43

Orthonormal basis for $L^2(R^d)$

Published on 18 Jan 2023 - 16:44

Orthonormality preserved when dualing?

Published on 19 Jan 2023 - 22:44

PCA proof, trace move

Published on 22 Jan 2023 - 13:46

Normalization conventions for explicit tensor representations of a $k$-form

Published on 27 Mar 2026 - 23:57

Does existence of orthonormal bases imply the Axiom of Choice?

Published on 28 Jan 2023 - 15:57