Abstract

Logic is concerned with the design or structure of arguments. It describes the forms of valid argument and is concerned with the public presentation and reception of arguments. Hence it has a close connection with politics and the public sphere, and with rhetoric as the science of persuasion. Philosophers have analysed the objective conditions of validation, that is, the justifiability of assertions about the world. This quest for objective and scientific validity in argumentation about the nature of reality dominated much of the development of logic in the 20th century. Logical arguments are held to be successful as a result of the ‘force of reason’ rather than because one's opponents have been bribed or coerced. Logic involves the study of the abstract, deductive moves in argumentation rather than an empirical study of how actual arguments are conducted. However, there is also a tension between rhetoric and philosophy; Plato drew a clear distinction between knowledge and persuasion. Logic is intended to give security to the former. The historical drift of logic is towards abstraction, especially the use of mathematical forms of representation. The study of logic is an important component of any project on encyclopaedic knowledge, that is, with knowledge that circulates in the public sphere, but the globalization of culture has raised an important problem about the universalistic claims of traditions of logic, namely, are there different forms of logical reasoning?