The truth value from the classical logic to fuzzy logic

The truth value has emerged as a result of discussion on the principles of logic. Homower, logic systems that excludes logic principles have evolved. This thesis aims to make clear and understandable as possible the similarity and difference between logic systems and secondly, to show how to examine the truth values of logic systems that have emerged as a result of criticism brought to the law of thw excluded middle, one of the main principles of logic, at the beginning, developmental period and today. In the first part of the study, it is tired to put forward what the classical logic and logic principles are. The secondpart is devoted to modern logic. In this chapter, the Fundamentals of modern logic formed by the symbolization of classical logic, truth value and control method in bivalent and multivalued logic are discussed. In the last part, the development of fuzzy logic which emerged in the second half of the 20th century, truth values and usage areas are discussed.