<研究論文(原著論文)>How to think about the paradox of Ushenko's picture "A New Epimenides"

Abstract

Andrew Paul Ushenko (1900?1956) devised “A New Epimenides”, a version of the liar paradox that uses a picture, in 1937. Subsequently, Ushenko, Encarnacion, Toms, and Donnellan discussed Ushenko's liar paradox in the 1950s. They argued at cross-purposes and failed to resolve their discussion because of Ushenko's death. A cause of this insufficient discussion is that Ushenko did not explain fully his own view about the relevant logic, which he called “intuitionalism.” He tried to advocate by using the classical philosophy of logic, that is, Aristotle’s philosophy of logic. Although it would not be accurate to say that he established intuitionalism as a new philosophy of logic, he showed early that the liar paradox highlights the difference between sentence types and sentence tokens, as well as contextual dependency.