# Quantum Mechanics.
Do the eigen vectors of every hermitian operator form a complete orthonormal set of vectors? Like eigen vectors of Potential energy, Kinetic energy, orbital angular momentum, spin angular momentum etc. When we can say for sure that yes they do form a basis in Hilbert space any state vector can be expanded in any of these basis? How to check it?
I am so much confused about it. Please help.........

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@Vincent-Lyon.Fr ,@Ghazi

No idea, that was too long ago!

alright, thanks..

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