Kramer's theorem

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Kramer's theorem

[′krā·mərz ‚thir·əm]
(solid-state physics)
The theorem that the states of a system consisting of an odd number of electrons in an external electrostatic field are at least twofold degenerate.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.