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Chapter Summary

Theophrastus' works include many on logic. This chapter begins with an overview of the sources such as Alexander of Aphrodisias, Themistius and Diogenes Laertius. Next, the chapter overviews the doctrines. Theophrastus worked within the field of Aristotelian logic, but developed some aspects of Aristotle's doctrines and challenged others. In this section, the chapter focuses on the language and symbolism to be used of Peripatetic logic. After outlining the title of the books that refer to the works on logic, the chapter provides a detailed discussion on various other issues including categorical syllogism, prosleptic syllogism and hypothetical syllogism.

Keywords: Alexander of Aphrodisias; categorical syllogism; Diogenes Laertius; hypothetical syllogism; Peripatetic logic; prosleptic syllogism; Themistius; Theophrastus' works



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