Given $Q = \sum_{i j s r} [(a_{i j s} − \frac{k_{i s} k_{j s}}{2m_{s}}) \delta(s,r) + c_{jsr} \delta(i,j)] \delta(\gamma_{i,s},\gamma_{j, j})$

Where $\delta$ is Kronecker function. I am having problem, with understanding this equation specifically this part $\delta(\gamma_{i,s},\gamma_{j, j})$. To be more precise , I know the definition of Kronecker function for $\delta(i,j)$ but how this guy, $\delta(\gamma_{i,s},\gamma_{j, j})$, behaves?

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    $\begingroup$ It's $1$ if $\gamma_{i,\,s}=\gamma_{j,\,j}$, or $0$ otherwise. $\endgroup$ – J.G. Apr 4 at 11:32

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