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Commutador de dos operadors.
Es defineix com commutador de dos operadors lineals i , definits sobre un mateix domini dens de cert espai de Hilbert, com un nou operador definit per la diferència del producte d'operadors:
Aquesta definició és anàloga a la noció general de commutador de dos elements d'una àlgebra, però cal parar atenció que en aquest cas es tracta d'operadors que potser no estan definits arreu.
- Quan els operadors actuen sobre un espai de dimensió finita llavors la traça del commutador de dos operadors és un operador amb traça nul·la.
- Si el commutador de dos operadors autoadjunts és nul llavors hi ha una base de Hilbert formada per vectors propis d'ambdós operadors. Aquesta propietat és de fonamental importància en mecànica quàntica a l'hora de construir un conjunt complet d'observables compatibles.
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Commutador de dos operadors
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