scalar density Definition and 1 Threads

Pardon my naive computational question. In my calculations, I encounter the following expression: $$ \frac{\delta}{\delta g^{\gamma \epsilon}(z)} \left( g_{\mu \alpha}(x) \nabla^x_\beta \nabla^x_\nu \delta(x-y)\right) $$ To take the functional derivatives, we first need to determine what...