List questions from unitary-matrices

Published on 07 May 2026 - 17:52

257

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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 29 Mar 2026 - 0:44

239

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Abelian subgroup of the unit quaternions

Published on 31 Mar 2026 - 5:13

626

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What is U(1)/Z2 isomorphic to?

Published on 27 Mar 2026 - 19:58

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

87

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How to generate random sparse unitary with given density?

Published on 10 May 2026 - 14:50

585

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Unitarily invariant norm of matrix

Published on 25 Mar 2026 - 7:49

1.7k

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Matrix exponentiation of a Kronecker product of Pauli matrices

Published on 14 Apr 2026 - 23:52

478

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constructing a unitary representation of $SU(2)$

Published on 25 Mar 2026 - 7:41

143

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

Published on 25 Mar 2026 - 7:49

353

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

Published on 25 Mar 2026 - 7:45

691

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

Published on 25 Mar 2026 - 7:42

48

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Matrices for symmetries of Möbius band

Published on 10 May 2026 - 14:07

215

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Is the identity the only matrix unchanged by unitary tranformation?

Published on 25 Mar 2026 - 11:13

485

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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 29 Apr 2026 - 12:32

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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