Question

Is real power of unitary matrix unitary?

score 813 · Answer 1 · 2026-03-22 14:50:38

813

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Is real power of unitary matrix unitary?

Published on 22 Mar 2026 - 14:50

score 84 · Answer 2 · 2019-04-22 12:46:15

84

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Prove that when writing up all even numbers in a column, then chaining $2n+1$ from them, we get all natural numbers exactly once.

Published on 22 Apr 2019 - 12:46

score 458 · Answer 3 · 2019-05-14 22:05:02

458

Views

Can a matrix have an uncountably-infinite( aleph-one or aleph-two) dimensions?

Published on 14 May 2019 - 22:05

score 250 · Answer 4 · 2019-06-17 07:38:41

250

Views

How to invert $\infty \times \infty$ matrix?

Published on 17 Jun 2019 - 7:38

score 297 · Answer 5 · 2019-07-27 13:51:18

297

Views

reduced row echelon form for an infinite matrix

Published on 27 Jul 2019 - 13:51

score 167 · Answer 6 · 2019-08-23 10:13:05

167

Views

Matrixes of higher order like $M_{\aleph\times \aleph}$

Published on 23 Aug 2019 - 10:13

score 400 · Answer 7 · 2014-03-23 14:31:31

400

Views

Frechet derivative of shift operator in $l_2$?

Published on 23 Mar 2014 - 14:31

score 1k · Answer 8 · 2026-03-20 00:10:44

1k

Views

Maximum eigenvalue and a corresponding eigenvector of an infinite Hilbert matrix

Published on 20 Mar 2026 - 0:10

score 406 · Answer 9 · 2014-07-20 23:42:46

406

Views

Orthogonal Operator Infinite Dimensional Inner Product Space

Published on 20 Jul 2014 - 23:42

score 2.5k · Answer 10 · 2014-08-21 15:02:20

2.5k

Views

Inverting the infinite matrix $+\mathbf{I}$ with entries $\mathbf{P}_{ij}={i-1\choose j-1}$

Published on 21 Aug 2014 - 15:02

score 262 · Answer 11 · 2026-02-23 12:08:08

262

Views

Why is it so difficult to obtain the spectral properties related to infinite matrices, especially when they are not symmetric?

Published on 23 Feb 2026 - 12:08

score 112 · Answer 12 · 2014-12-30 15:35:22

112

Views

Is there a systematic relation between the generating functions for the rows vs that for columns of infinite sized Carleman-matrices?

Published on 30 Dec 2014 - 15:35

score 716 · Answer 13 · 2019-10-27 00:07:28

716

Views

Does Schmidt decomposition exist on infinite dimensional Hilbert spaces?

Published on 27 Oct 2019 - 0:07

score 47 · Answer 14 · 2026-03-11 06:51:53

47

Views

If $I+B$ is invertible in $l^2(\mathbb{Z})$ where $B$ is a compact opreator, is $I+B^N$ invertible where $B^N$ is a truncated version of $B$?

Published on 11 Mar 2026 - 6:51

score 129 · Answer 15 · 2019-12-02 12:41:59

129

Views

Can I assign the term "is eigenvector" and "is eigenmatrix" of matrix P in my specific (infinite-size) case?

Published on 02 Dec 2019 - 12:41

List Question

Is real power of unitary matrix unitary?

Prove that when writing up all even numbers in a column, then chaining $2n+1$ from them, we get all natural numbers exactly once.

Can a matrix have an uncountably-infinite( aleph-one or aleph-two) dimensions?

How to invert $\infty \times \infty$ matrix?

reduced row echelon form for an infinite matrix

Matrixes of higher order like $M_{\aleph\times \aleph}$

Frechet derivative of shift operator in $l_2$?

Maximum eigenvalue and a corresponding eigenvector of an infinite Hilbert matrix

Orthogonal Operator Infinite Dimensional Inner Product Space

Inverting the infinite matrix $+\mathbf{I}$ with entries $\mathbf{P}_{ij}={i-1\choose j-1}$

Why is it so difficult to obtain the spectral properties related to infinite matrices, especially when they are not symmetric?

Is there a systematic relation between the generating functions for the rows vs that for columns of infinite sized Carleman-matrices?

Does Schmidt decomposition exist on infinite dimensional Hilbert spaces?

If $I+B$ is invertible in $l^2(\mathbb{Z})$ where $B$ is a compact opreator, is $I+B^N$ invertible where $B^N$ is a truncated version of $B$?

Can I assign the term "is eigenvector" and "is eigenmatrix" of matrix P in my specific (infinite-size) case?

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