New posts in Commutator

Matrix elements for the particle on a ring

Quantum fields as differential operators

Common eigenfunctions of commuting operators: case of degeneracy

How to show that $[L_i, v_j]=i\hbar\sum_k \epsilon_{ijk}v_k$ for any vector $\textbf{v}$ constructed from $\textbf{x}$ and/or $\nabla$?

Why is this sum the delta function?

For $[A,B]=0$, if an eigenfunction of $A$ not an eigenfunction of $B$, does that imply degeneracy of one operator?

Operators "carrying" momentum and particle number

Why are the commutators for spin taken as postulates?

Quantum field theory, interpretation of commutation relation

Symmetry in quantum mechanics