Question

Are there formulas for sums of products of unitary matrices of the form $\sum_i U_{ij}U_{il}U_{ik}^* U_{im}^*$?

score 66 · Answer 1 · 2026-04-14 05:18:22

66

Views

Are there formulas for sums of products of unitary matrices of the form $\sum_i U_{ij}U_{il}U_{ik}^* U_{im}^*$?

Published on 14 Apr 2026 - 5:18

score 366 · Answer 2 · 2026-04-15 18:54:30

366

Views

Find orthonormal basis given inner product.

Published on 15 Apr 2026 - 18:54

score 58 · Answer 3 · 2026-04-15 20:59:06

58

Views

Showing that there exists a set of vectors, such that multiplied by a matrix, we'll get the orthonormal basis for the matrix

Published on 15 Apr 2026 - 20:59

score 901 · Answer 4 · 2026-04-17 10:27:04

901

Views

Find a scalar product of the vector space defined by its basis vectors

Published on 17 Apr 2026 - 10:27

score 210 · Answer 5 · 2026-04-15 21:22:38

210

Views

Generalization of characterization of projection onto a convex set

Published on 15 Apr 2026 - 21:22

score 1.1k · Answer 6 · 2026-05-06 14:12:25

1.1k

Views

Do you know if eigenvectors of idempotent matrices are always orthonormal?

Published on 06 May 2026 - 14:12

score 449 · Answer 7 · 2026-04-17 09:56:20

449

Views

Find an orthogonal basis for ℝ3 that begins with an orthogonal basis for Col()

Published on 17 Apr 2026 - 9:56

score 409 · Answer 8 · 2026-04-16 07:57:15

409

Views

Dense sets in Hilbert space of square summable sequences?

Published on 16 Apr 2026 - 7:57

score 95 · Answer 9 · 2026-04-15 23:32:55

95

Views

Find the resulting orthonormal basis.

Published on 15 Apr 2026 - 23:32

score 117 · Answer 10 · 2026-04-29 12:42:59

117

Views

Finding the basis that results from an inner space

Published on 29 Apr 2026 - 12:42

score 167 · Answer 11 · 2026-04-09 03:37:39

167

Views

Tangent plane of implicit surface from normal derivative

Published on 09 Apr 2026 - 3:37

score 607 · Answer 12 · 2026-04-13 08:50:36

607

Views

Obtain (or close to) Identity matrix by multiplying two vectors such as: $D * (C)^H = I$

Published on 13 Apr 2026 - 8:50

score 347 · Answer 13 · 2026-04-12 01:41:56

347

Views

Projection on uncountable orthonormal set

Published on 12 Apr 2026 - 1:41

score 106 · Answer 14 · 2026-04-14 10:34:09

106

Views

orthogonal basis - counter example

Published on 14 Apr 2026 - 10:34

score 55 · Answer 15 · 2026-04-29 12:27:34

55

Views

Derivatives of an expansion of a function

Published on 29 Apr 2026 - 12:27

List Question

Are there formulas for sums of products of unitary matrices of the form $\sum_i U_{ij}U_{il}U_{ik}^* U_{im}^*$?

Find orthonormal basis given inner product.

Showing that there exists a set of vectors, such that multiplied by a matrix, we'll get the orthonormal basis for the matrix

Find a scalar product of the vector space defined by its basis vectors

Generalization of characterization of projection onto a convex set

Do you know if eigenvectors of idempotent matrices are always orthonormal?

Find an orthogonal basis for ℝ3 that begins with an orthogonal basis for Col()

Dense sets in Hilbert space of square summable sequences?

Find the resulting orthonormal basis.

Finding the basis that results from an inner space

Tangent plane of implicit surface from normal derivative

Obtain (or close to) Identity matrix by multiplying two vectors such as: $D * (C)^H = I$

Projection on uncountable orthonormal set

orthogonal basis - counter example

Derivatives of an expansion of a function

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