Abstract
The review is about the book Kdyby chyby (If mistakes). The main topic of the book are thought experiments (the subtitle of the book is "Epistemology of thought experiments").
The topics include also what we might call ontology of thought experiments, which we can find mainly in the first part of the book (e.g. dealing with Mach's psychologism). The author of the book gives an answer to questions about epistemic status of thought experiments by offering the concept of prima facie reasoning.
It should be a humble conception, which does not have big epistemic ambitions, but still helps against scepticism about thought experiments. The review argues that the prima facie reasoning is not interesting enough, since it is fully based on the assumption the opponent will accept the thought experiment (and in this sense it is no different than other potentially irrelevant reasoning, like crystal ball divination).