How to prove that the position operator in momentum is $i\hbar \partial/\partial p$ - One Missing Sign
49759
Proving that $i\hbar\frac{\partial}{\partial \mathbf{p}}$ is the operator of $\mathbf{x}$ in momentum space
14867
How to interpret $\langle x|\hat Q|x'\rangle$ for a quantum mechanical operator $\hat Q$?
41407
How to derive or justify the expressions of momentum operator and energy operator?
108351
Derivation of position operator in QM
136184
Why we dont have "direct" velocity operator just as $p$? ( as use $p$ space not $v$? ) in quantum mechanics?
98535
Are eigenstates of the position operator continuous?
73624
Why is orbital angular momentum quantized according to $I= \hbar \sqrt{\ell(\ell+1)}$?
65890
Proof that energy states of a harmonic oscillator given by ladder operator include all states
45061
Physical interpretation of $Q^i = \partial _\nu T^{i \nu}$
69474
Orthogonal projections with $\sum P_i =I$, proving that $i\ne j \Rightarrow  P_{j}P_{i}=0$
14203
Finding the creation/annihilation operators
116799
Theoretical Proof of Pauli's Exclusion Principle
147524
Why is the "canonical momentum" for the Dirac equation not defined in terms of the "gauge covariant derivative"?
123478
Generalized Poincaré Inequality on H1 proof.
28416
Show that $\partial_\nu T^{\mu\nu} = - j_\nu F^{\mu\nu}$
152932
Proof: $\det\pmatrix{\langle v_i , v_j \rangle}\neq0$ $\iff \{v_1,\dots,v_n\}~\text{l.i.}$
128875
Expectation values of the position operator is equal to zero in case of even potentials?