n In the absence of degeneracy, if a measured value of energy of a quantum system is determined, the corresponding state of the system is assumed to be known, since only one eigenstate corresponds to each energy eigenvalue. ( This videos explains the concept of degeneracy of energy levels and also explains the concept of angular momentum and magnetic quantum number . n H n n {\displaystyle {\hat {A}}} such that , which is doubled if the spin degeneracy is included. , so that the above constant is zero and we have no degeneracy. m Together with the zero vector, the set of all eigenvectors corresponding to a given eigenvalue form a subspace of Cn, which is called the eigenspace of . He has authored Dummies titles including Physics For Dummies and Physics Essentials For Dummies. Dr. Holzner received his PhD at Cornell.

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