this volume contains papers on truth, logic, semantics, and history of logic and philosophy. these papers are dedicated to jan wolenski to honour his 60th birthday.jan wolenski is professor of philosophy at the department of philosophy of the jagiellonian university in cracow, poland. he is likely to be the most well-known polish philosopher of this time, best known for his work on the history of the philosophy and logic of the lvov-warsaw school. furthermore, hes published numerous books and articles dealing with various issues of epistemology and philosophy of language this collection is mainly addressed to researchers and graduate students in philosophy, logic, and history and philosophy of science.