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Kramers' theorem

Kramers' theorem proper noun: a theorem stating that, for every energy eigenstate of a time-reversal symmetric system with half-integer total spin, there is another eigenstate with the same energy related by time-reversal. In other words, the degeneracy of every energy level is an even number if it has half-integer spin.

Proper noun

Kramers' theorem

  1. (quantum mechanics) A theorem stating that, for every energy eigenstate of a time-reversal symmetric system with half-integer total spin, there is another eigenstate with the same energy related by time-reversal. In other words, the degeneracy of every energy level is an even number if it has half-integer spin.

Origin of Kramers' theorem

Named after Dutch physicist H. A. Kramers.

Questions about Kramers' theorem

What does Kramers' theorem mean?
Kramers' theorem means a theorem stating that, for every energy eigenstate of a time-reversal symmetric system with half-integer total spin, there is another eigenstate with the same energy related by time-reversal. In other words, the degeneracy of every energy level is an even number if it has half-integer spin.
What part of speech is Kramers' theorem?
Kramers' theorem is a proper noun.

Words near Kramers' theorem in the dictionary

  1. krameric
  2. Kramering
  3. Kramers
  4. Kramers pair
  5. Kramers pairs
  6. Kramers' theorem
  7. Kramp
  8. Kramps
  9. Krampus
  10. Krampuses
  11. kran

Source and license

Adapted from Wiktionary: Kramers' theorem (page history and authors). Text available under the Creative Commons Attribution-ShareAlike 4.0 license. Word.ws reformatted the entry and added links. Wiktionary data of 2026-09-02.

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