If you have an operator a represented in some basis l1>, l2> you find its matrix elements by doing(adsbygoogle = window.adsbygoogle || []).push({});

Aij = <ilAlj>

But more oftenly you are interested in the expectation value of A. So you take:

<ψlAlψ>. My teacher tends to call these numbers matrix elements too. But which matrix element in A is this and how do I realize that? :)

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# Matrix elements

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