Ajdukiewicz, Kazimierz (1890–1963)

Ajdukiewicz, like other typical members of the Lwów–Warsaw School, the main Polish analytic movement, was basically interested in logic, philosophy of language, epistemology, and philosophy of science. In the 1930s, he proposed a form of radical conventionalism, an extension of the conventionalism of Duhem and Poincaré. Later, he rejected this radical conventionalism in favour of a semantic epistemology. In the philosophy of science he tried to build a general theory of fallible inferences based on decision theory. Ajdukiewicz’s most important contribution to logic is his formal notation for syntactic categories.