 The formal frameworks we have seen so far foreground dynamical principles of belief revision—they are essentially concerned with how to accommodate new information. That theoretical emphasis relegates other issues to the background. In particular, these frameworks cannot easily express principles of higher-order belief (regulating beliefs about beliefs), or about the relationship between belief and knowledge. Therefore, these frameworks are relatively silent about classical epistemological issues such as whether knowledge entails belief (see the entry on the  analysis of knowledge),  or why it is absurd to believe both \(p\) and that you don't believe that \(p\) (see the entry on   epistemic paradoxes).