For matrix element ##(a)_{i,j}##(adsbygoogle = window.adsbygoogle || []).push({});

##j## represent column. Is this always the case? For example in case of linear harmonic oscillator ##(\hat{a}^+)_{1,0}=\langle 1|\hat{a}^+|0 \rangle =1##. It is easier to me to see this in Dirac notation, because kets are columns and bras are rows.

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# Matrix elements. LHO.

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