List questions from unitary-matrices

Published on 13 Jul 2019 - 13:33

113

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Matrix orthogonal if and only if another matrix unitary

Published on 17 Jul 2019 - 8:20

303

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Are there infinitely many unitary matrices?

Published on 18 Jul 2019 - 21:29

75

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An example for almost commuting matrices

Published on 01 Aug 2019 - 12:10

74

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Unitary matrix norms that are symmetric under singular value inversion (taking Moore–Penrose inverse)

Published on 01 Aug 2019 - 22:22

474

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What are some lesser known unitary invariant norms for matrices?

Published on 01 Aug 2019 - 22:51

48

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why is this vector multiplication move valid?

Published on 02 Aug 2019 - 14:51

56

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Proof that $\dfrac{\partial U_t}{\partial t} U_t^\dagger$ is anti-Hermitian by integration by parts

Published on 03 Aug 2019 - 5:02

1.6k

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Verify the matrix exponential $e^{i\hat{H}t/\hbar}$ is unitary

Published on 04 Aug 2019 - 7:26

892

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Prove this matrix to be unitary

Published on 05 Aug 2019 - 4:39

446

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Is $SU(n) \subset \text{Spin}(2n)$?

Published on 09 Aug 2019 - 9:55

1.4k

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Hermitian (?) representations of $su(2)$

Published on 10 Aug 2019 - 8:30

186

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When is there an inner product making a given matrix unitary?

Published on 20 Aug 2019 - 13:46

113

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Find the reflection of the point $(4,-13)$ in the line $5x+y+6=0$

Published on 01 Sep 2019 - 12:23

239

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Does every bistochastic matrix $A$ have a unitary matrix $U$ s.t. $a_{ij} = |u_{ij}|^2$?

Published on 07 Sep 2019 - 10:46

List Question

Lie Group Homomorphism from $U(n)$ into $SO(2)$

Matrix orthogonal if and only if another matrix unitary

Are there infinitely many unitary matrices?

An example for almost commuting matrices

Unitary matrix norms that are symmetric under singular value inversion (taking Moore–Penrose inverse)

What are some lesser known unitary invariant norms for matrices?

why is this vector multiplication move valid?

Proof that $\dfrac{\partial U_t}{\partial t} U_t^\dagger$ is anti-Hermitian by integration by parts

Verify the matrix exponential $e^{i\hat{H}t/\hbar}$ is unitary

Prove this matrix to be unitary

Is $SU(n) \subset \text{Spin}(2n)$?

Hermitian (?) representations of $su(2)$

When is there an inner product making a given matrix unitary?

Find the reflection of the point $(4,-13)$ in the line $5x+y+6=0$

Does every bistochastic matrix $A$ have a unitary matrix $U$ s.t. $a_{ij} = |u_{ij}|^2$?

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