List questions from unitary-matrices

Published on 22 Jul 2021 - 7:45

134

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prove that if $X$ is skew- symmetric matrix of order $n$ and$(X^2+I_n)$ is non singular then $(iX+I_n)^{-1} +I_n$ is unitary matrix

Published on 30 Jul 2021 - 5:29

195

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What is $PU(n,m)$?

Published on 31 Jul 2021 - 8:18

205

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Identification of Lagrangian Grassmannian with unitary group

Published on 24 Feb 2026 - 0:49

64

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Is $A_1^i \overline{A_1^j} A_1^k \overline{A_1^{\ell}} = \overline{A_i^1} A_j^1 A_1^k \overline{A_1^{\ell}} = \delta_i^k \delta_j^{\ell}$ true?

Published on 12 Aug 2021 - 3:28

92

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Finding the Lie Algebra su(2) via the Implicit function Theorem

Published on 23 Aug 2021 - 16:48

27

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How does a nonnegative matrix (with spectral radius $\rho(A) \geq 1$) change the magnitude of the L1 norm of a vector?

Published on 26 Feb 2026 - 18:16

429

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Parametrization of $3 \times 3$ unitaries

Published on 30 Aug 2021 - 15:05

61

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Complex lattices and unitary matrices

Published on 31 Aug 2021 - 9:53

112

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Product of unitary matrix and hermitian matrix

Published on 26 Mar 2026 - 7:38

255

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On properties of time-evolution operator in QM

Published on 03 Sep 2021 - 11:29

135

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Understanding the Unitary Operator $U|\psi\rangle\otimes|0\rangle=\sum_m M_m|\psi\rangle\otimes|m\rangle$

Published on 26 Mar 2026 - 21:09

627

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Unitary operators, inner products and unit operators with Dirac notation

Published on 14 Sep 2021 - 15:15

71

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find V such as $VAV^\dagger=UA$

Published on 27 Mar 2026 - 0:56

28

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if $B^3=C^3=BC=\mathbb I$ can we say anything about $L$ if $e^L=B+C?$

Published on 26 Mar 2026 - 12:40

List Question

The form of an $n \times n$ unitary matrix

prove that if $X$ is skew- symmetric matrix of order $n$ and$(X^2+I_n)$ is non singular then $(iX+I_n)^{-1} +I_n$ is unitary matrix

What is $PU(n,m)$?

Identification of Lagrangian Grassmannian with unitary group

Is $A_1^i \overline{A_1^j} A_1^k \overline{A_1^{\ell}} = \overline{A_i^1} A_j^1 A_1^k \overline{A_1^{\ell}} = \delta_i^k \delta_j^{\ell}$ true?

Finding the Lie Algebra su(2) via the Implicit function Theorem

How does a nonnegative matrix (with spectral radius $\rho(A) \geq 1$) change the magnitude of the L1 norm of a vector?

Parametrization of $3 \times 3$ unitaries

Complex lattices and unitary matrices

Product of unitary matrix and hermitian matrix

On properties of time-evolution operator in QM

Understanding the Unitary Operator $U|\psi\rangle\otimes|0\rangle=\sum_m M_m|\psi\rangle\otimes|m\rangle$

Unitary operators, inner products and unit operators with Dirac notation

find V such as $VAV^\dagger=UA$

if $B^3=C^3=BC=\mathbb I$ can we say anything about $L$ if $e^L=B+C?$

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