List questions from quantum-mechanics

Published on 22 May 2023 - 15:32

75

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If $0\leq A\leq B$ then the corresponding densities satisfy $0\leq\rho_A\leq \rho_B$

Published on 22 May 2023 - 16:46

42

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If $A\geq 0$ and $0\leq B\leq C$, then $0\leq \sqrt{B}A\sqrt{B}\leq \sqrt{C}A\sqrt{C}$

Published on 23 May 2023 - 9:15

86

Views

Wigner matrices: Which vectors are simultaneous eigen-bases of $J^2$ and $J_z$?

Published on 24 May 2023 - 9:29

39

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Determinable randomness, indeterminable certainty?

Published on 26 May 2023 - 1:16

52

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How does the canonical commutator works on differential operators?

Published on 25 Mar 2026 - 21:01

102

Views

Power rule for derivative operator $D^n$

Published on 27 May 2023 - 16:00

29

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A result involving a family $\{\xi_t:t\in T\}$ of non-interferring real valued observales on Hilbert space $H$

Published on 26 Mar 2026 - 8:02

53

Views

Decomposition of a unitary operator on a non-separable Hilbert space

Published on 01 Jun 2023 - 20:35

75

Views

Need to find a value of $\alpha$ for which some integral is negative

Published on 02 Jun 2023 - 20:31

208

Views

Prove/show that $\epsilon_{ijk}(\hat a_j \hat b_k-\hat b_k \hat a_j)=2\epsilon_{ijk}\hat a_j\hat b_k$

Published on 06 Jun 2023 - 23:04

61

Views

Stone's theorem in the presence of superselection rules

Published on 12 Jun 2023 - 18:29

25

Views

Question about the toric code

Published on 25 Mar 2026 - 17:35

63

Views

How many objects can I perceive to all be travelling at speed arbitrarily close to $\sqrt 2\cdot c$ relative to each other?

Published on 23 Feb 2026 - 6:24

80

Views

Multiple highest weights of $\mathfrak{sl}(2)$

Published on 25 Mar 2026 - 6:09

List Question

If $0\leq A\leq B$ and $C\geq0$ then does $0\leq AC\leq BC$?

If $0\leq A\leq B$ then the corresponding densities satisfy $0\leq\rho_A\leq \rho_B$

If $A\geq 0$ and $0\leq B\leq C$, then $0\leq \sqrt{B}A\sqrt{B}\leq \sqrt{C}A\sqrt{C}$

Wigner matrices: Which vectors are simultaneous eigen-bases of $J^2$ and $J_z$?

Determinable randomness, indeterminable certainty?

How does the canonical commutator works on differential operators?

Power rule for derivative operator $D^n$

A result involving a family $\{\xi_t:t\in T\}$ of non-interferring real valued observales on Hilbert space $H$

Decomposition of a unitary operator on a non-separable Hilbert space

Need to find a value of $\alpha$ for which some integral is negative

Prove/show that $\epsilon_{ijk}(\hat a_j \hat b_k-\hat b_k \hat a_j)=2\epsilon_{ijk}\hat a_j\hat b_k$

Stone's theorem in the presence of superselection rules

Question about the toric code

How many objects can I perceive to all be travelling at speed arbitrarily close to $\sqrt 2\cdot c$ relative to each other?

Multiple highest weights of $\mathfrak{sl}(2)$

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