If ##\hat{n}=\hat{a}^+\hat{a}## is number operator and [tex]\hat{a}^+[/tex],[tex]\hat{a}[/tex] are Bose operators. Is there then some formula for(adsbygoogle = window.adsbygoogle || []).push({});

[tex][f(\hat{n}),\hat{a}][/tex]

[tex][f(\hat{n}),\hat{a}^+][/tex]

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# Commutator question

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