Why in quantum mechanics must orthogonal states stay orthogonal?
34004
Why is time evolution unitary?
13137
Why are Hermitian operators linked to observables?
29230
Orthogonality of Hermite functions
87951
Normalizable wavefunction that does not vanish at infinity
87962
Why is $\langle \textbf R \rangle =Tr \rho R$ here $\rho$ is the state density matrix
41469
How is quantum superposition different from mixed state?
103624
What is the Physical Meaning of Commutation of Two Operators?
591
Reason for the discreteness arising in quantum mechanics?
147491
When is separating the total wavefunction into a space part and a spin part possible?
88926
Why do we use operators in quantum mechanics?
18982
Does Quantum Mechanics assume space and time are continuous?
105764
Are identical particles always entangled even when not interacting?
114247
Allowed Wave Functions of System
111769
Why is inverse of orthogonal matrix is its transpose?
9436
How to define an orthogonal basis in the right way?
104244
Is the Momentum Operator a Postulate?
55691
Are states of a quantum system represented by vectors in a Hilbert space?