I want to calculate the KL-divergence between the likelihood $p(r|c)$ and a prior $q(r)$, like it is done in this paper (section D.1) to show that minimizing the KL divergence implements the independence of $q$ and $r$, but I am stuck here: $$\begin{split} KL\left[p(r|c) || q(r) \right] & = \int...