If x,y,z are the position operators.(adsbygoogle = window.adsbygoogle || []).push({});

Is it true that:

<φ|x|φ> + <φ|y|φ> + <φ|z|φ> = <φ | x+y+z| φ> ?

So that if, for example, one wanted to compute <φ|r|φ> (where r =x+y+z), then they would just have to sum the parts.

I know that for scalars, a and b, we have the following:

(a+b)|φ> = a|φ> + b|φ>

But I don't know for sure if this is related at all to the case for operators (especially when they are sandwiched between the bra and the ket.

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# Braket notation help

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