The main topic of the book is how to argue for formal epistemic norms of credence. The author advocates formal justificational pluralism, suggesting that it is reasonable to use various formal tools, e.g. different “scoring rules”, in arguments for synchronic and diachronic norms.
Wroński’s results are unified by applying proper mathematical methods to different and yet interconnected aspects of key elements of currently ongoing debates about bayesian epistemology. The book is a research monograph on a technically and philosophically advanced topic. The work is not for the faint-hearted, but Wroński definitely succeeds at showing that this is rightly so. By approaching the problems in a good mathematical form Wroński shows that in formal philosophy the devil is often in the detail. And he has quite a lot to learn from Wroński.