The purpose of this paper is to present the Fitch's paradox. The reasoning similar to the Fitch's argument is applied to a concept of belief and thus some observations on the knowledge, beliefs and their boundaries are drawn. Interactions among completeness of knowledge, and of beliefs, omniscience and Fitch's theorem are examined. A few erroneous application of Fitch's argumentation or unsupported conclusion drawn from it are shown.
T. A. Puczylowski, Uniwersytet Warszawski, Instytut Filozofii, Zaklad Logiki, ul. Krakowskie Przedmiescie 3, 00-047 Warszawa, Poland
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