The aim of this book is the analysis of Kazimierz Ajdukiewicz’s meta-epistemological project of the semantic theory of knowledge and its implementations to solve certain traditional epistemological problems and their metaphysical consequences. This project claims that cognitive problems need to be approached from the perspective of language. One of the results of this analysis is the thesis that the philosophical-linguistic legitimisation for the meta-epistemological project is the philosophy of Edmund Husserl from his Logical Investigations. This is the philosophy that makes it possible to speak reasonably of a close relation between thinking and language and provides thereby the legitimisation for this project.
