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I am thinking for some hours about the commutation of the field-Operator/(annihilation-Operator): [itex]\Psi[/itex] and the vector-potential: [itex]\vec{A(\vec{r})}[/itex].

I have noticed in my lecture notes that [itex]\vec{A(\vec{r})}\Psi = \Psi\vec{A(\vec{r})}[/itex].

But I don't understand why they commute?

Thank u!

Abby

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# Commutation of Vector-Potential and Field-Operator

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