Peirce's logic and semiotics are mutually defined.logic is understood from the perspective of semiotics:in the early stage,Peirce positioned logic within the framework of semiotics,of which logic is a branch,and in the later pe-riod,logic was completely defined in terms of semiotics.Conversely,Peirce's examination of semiotics has been close-ly linked to his study of logic from the beginning.On the one hand,Peirce wanted to overcome psychologism in the study of logic by means of semiotics;on the other hand,Peirce's semiotics was first and foremost at the service of the study of logic.Although Peirce's goal was to establish a universal semiotics,the two aspects are of fundamental im-portance that must be given special attention if his semiotics is to be better understood.
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