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 63 · Answer 1 · 2018-04-19 11:10:10

63

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 19 Apr 2018 - 11:10

score 362 · Answer 2 · 2018-04-20 01:37:42

362

Views

Find orthonormal basis given inner product.

Published on 20 Apr 2018 - 1:37

score 54 · Answer 3 · 2018-04-23 23:54:37

54

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 23 Apr 2018 - 23:54

score 898 · Answer 4 · 2018-04-24 19:40:58

898

Views

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

Published on 24 Apr 2018 - 19:40

score 208 · Answer 5 · 2026-03-24 23:46:44

208

Views

Generalization of characterization of projection onto a convex set

Published on 24 Mar 2026 - 23:46

score 1.1k · Answer 6 · 2026-03-22 11:49:32

1.1k

Views

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

Published on 22 Mar 2026 - 11:49

score 447 · Answer 7 · 2018-05-01 14:06:49

447

Views

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

Published on 01 May 2018 - 14:06

score 406 · Answer 8 · 2018-05-02 12:08:33

406

Views

Dense sets in Hilbert space of square summable sequences?

Published on 02 May 2018 - 12:08

score 90 · Answer 9 · 2018-05-03 01:26:50

90

Views

Find the resulting orthonormal basis.

Published on 03 May 2018 - 1:26

score 112 · Answer 10 · 2026-03-25 04:42:22

112

Views

Finding the basis that results from an inner space

Published on 25 Mar 2026 - 4:42

score 166 · Answer 11 · 2026-02-23 01:19:15

166

Views

Tangent plane of implicit surface from normal derivative

Published on 23 Feb 2026 - 1:19

score 606 · Answer 12 · 2026-03-25 07:48:38

606

Views

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

Published on 25 Mar 2026 - 7:48

score 343 · Answer 13 · 2018-05-11 18:22:00

343

Views

Projection on uncountable orthonormal set

Published on 11 May 2018 - 18:22

score 102 · Answer 14 · 2018-05-13 09:27:51

102

Views

orthogonal basis - counter example

Published on 13 May 2018 - 9:27

score 51 · Answer 15 · 2026-03-25 06:05:04

51

Views

Derivatives of an expansion of a function

Published on 25 Mar 2026 - 6:05

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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