This chapter focuses on the study of the logic of necessity and possibility, which is taken to be logically dual to one another and therefore definable in terms of one another. The authors define modal logic as a systematic development of the logic of the various notions that are expressed in natural language by modal words and phrases. The authors begin with concatenation theory and the logistic method in this chapter. They describe the construction of expressions, formal languages, and formal systems or calculi by means of this theory and method.
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