Kramer's theorem
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.