Definitions
from Wiktionary, Creative Commons Attribution/ShareAlike License.
 noun mathematics A
function such that, for a givenlinear operator , for somescalar (called aneigenvalue ).
Etymologies
from Wiktionary, Creative Commons Attribution/ShareAlike License
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Examples

The Copenhagen interpretation of QM says that the wavefunction should "collapse" (revert to a single eigenfunction) everywhere simultaneously when an observation is made.

The Copenhagen interpretation of QM says that the wavefunction should "collapse" (revert to a single eigenfunction) everywhere simultaneously when an observation is made.

\Phi+\bar {\Phi} is an eigenfunction belonging to '' E '', which means that the wave function may be chosen real.
Citizendium, the Citizens' Compendium  Recent changes [en] 2009

The Copenhagen interpretation of QM says that the wavefunction should "collapse" (revert to a single eigenfunction) everywhere simultaneously when an observation is made.
Conservapedia  Recent changes [en] Cuddlytakun 2009

The Copenhagen interpretation of QM says that the wavefunction should "collapse" (revert to a single eigenfunction) everywhere simultaneously when an observation is made.

The exception being the case that is an eigenfunction belonging to E, which means that the wave function may be chosen real.
Citizendium, the Citizens' Compendium  Recent changes [en] 2009

The Copenhagen interpretation of QM says that the wavefunction should "collapse" (revert to a single eigenfunction) everywhere simultaneously when an observation is made.
Conservapedia  Recent changes [en] KSorenson 2009

The Copenhagen interpretation of QM says that the wavefunction should "collapse" (revert to a single eigenfunction) everywhere simultaneously when an observation is made.

\Phi+\bar {\Phi} is an eigenfunction belonging to '' E '', which means that the wave function may be chosen real.
Citizendium, the Citizens' Compendium  Recent changes [en] 2009

The Copenhagen interpretation of QM says that the wavefunction should "collapse" (revert to a single eigenfunction) everywhere simultaneously when an observation is made.
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