Wronskian of a Harmonic oscillator
50707
Does the conservation of the Wronskian follow from Noether's principle?
122341
Exponential of a Differential Operator
79196
Integrability of the Hilbert transform of a Schwartz function
128159
the Riemann integrability of inverse function
96919
Characteristic equation of a recurrence relation
87951
Normalizable wavefunction that does not vanish at infinity
126425
Consistent, complete, and generalized description of the quantum harmonic oscillator
49633
Hermitian conjugate of differential operator
90336
Harmonic oscillator coherent state expectation values
133609
orthonormal system in a Hilbert space
8192
Simple proof of showing the Harmonic number $H_n = \Theta (\log n)$
62693
Eigenspaces of angular momentum operator and its square (Casimir operator)
128361
The kernel and range of the powers of a self-adjoint operator
92044
Sturm-Liouville Questions
121547
Differential equation for Harmonic Motion
44747
Finding the effective Hamiltonian in a certain subspace
10357
Do harmonic numbers have a “closed-form” expression?