Kazimierz Ajdukiewicz's Views on Ontology

Abstract This article will address the views of Kazimierz Ajdukiewicz - the leading representative of the Lvov-Warsaw School. I will present arguments proving that the Polish philosopher could have anticipated contemporary metaontological discussions. In the first part, I will provide a profile of Ajdukiewicz as a representative of the Lvov-Warsaw School. I will outline the assumptions of his metaepistemological projects: radical conventionalism and semantic epistemology. In the second part, I will argue that the former project resulted in views on existence similar to Hilary Putnam's and Eli Hirsch's, whereas the outcomes of the other project are views similar to those of Amie Thomasson and her easy ontology project.