List questions from unitary-matrices

Published on 24 Mar 2026 - 21:58

256

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If $A$ and $B$ are unitarily equivalent, then $\sum_{i,j}|A_{ij}|^2 = \sum_{i,j}|B_{ij}|^2$

Published on 02 Nov 2019 - 11:09

237

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Abelian subgroup of the unit quaternions

Published on 13 Nov 2019 - 8:48

625

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What is U(1)/Z2 isomorphic to?

Published on 14 Nov 2019 - 21:27

32

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A matrix $g$ is in the Unitary Group iff $g \bar g^t=I$

Published on 19 Nov 2019 - 19:24

85

Views

How to generate random sparse unitary with given density?

Published on 21 Nov 2019 - 22:29

584

Views

Unitarily invariant norm of matrix

Published on 25 Nov 2019 - 13:07

1.7k

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Matrix exponentiation of a Kronecker product of Pauli matrices

Published on 27 Nov 2019 - 0:26

477

Views

constructing a unitary representation of $SU(2)$

Published on 29 Nov 2019 - 7:41

142

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What are the fixed-point free subgroups of $\mathrm U(2)$?

Published on 30 Nov 2019 - 17:37

352

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Are the irreducible representations of $U(n)$ the same as $SU(n)$?

Published on 03 Dec 2019 - 23:51

690

Views

Are the groups $SU(2, ℂ)$ and $U(1, ℍ)$ isomorphic?

Published on 09 Dec 2019 - 23:47

45

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Matrices for symmetries of Möbius band

Published on 16 Dec 2019 - 1:59

214

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Is the identity the only matrix unchanged by unitary tranformation?

Published on 16 Dec 2019 - 15:10

483

Views

If A is unitary and $\det (A^H) = \det(A^)$ and $\det(A) \det(A^) = \det(A)^2$ Why can't I say that $\det(A^H) = \pm\det(A)$

Published on 22 Dec 2019 - 9:37

List Question

Quaternions and $SU(2)$

If $A$ and $B$ are unitarily equivalent, then $\sum_{i,j}|A_{ij}|^2 = \sum_{i,j}|B_{ij}|^2$

Abelian subgroup of the unit quaternions

What is U(1)/Z2 isomorphic to?

A matrix $g$ is in the Unitary Group iff $g \bar g^t=I$

How to generate random sparse unitary with given density?

Unitarily invariant norm of matrix

Matrix exponentiation of a Kronecker product of Pauli matrices

constructing a unitary representation of $SU(2)$

What are the fixed-point free subgroups of $\mathrm U(2)$?

Are the irreducible representations of $U(n)$ the same as $SU(n)$?

Are the groups $SU(2, ℂ)$ and $U(1, ℍ)$ isomorphic?

Matrices for symmetries of Möbius band

Is the identity the only matrix unchanged by unitary tranformation?

If A is unitary and $\det (A^H) = \det(A^)$ and $\det(A) \det(A^) = \det(A)^2$ Why can't I say that $\det(A^H) = \pm\det(A)$

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