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What is Logic?

What is Logic?

This is the homepage of my draft textbook, What is Logic?. The DRAFT status of this book is very important: Portions of it are substantially incomplete. If, however, you find any errors, please let me know.

There is a supplementary series of youtube videos covering content in this book.

Recent updates:

  • 2025-02-03: Uploaded draft 2025-02-03; this version adds references for the DeMorgan quote in Chapter 6.
  • 2024-04-04: Uploaded draft 2024-04-04; this version adds Section 10.6.
  • 2023-05-05: Uploaded draft 2023-05-05; this version adds more exercises to Exercise 73, explicitly mentions the copulae in the syllogistic mnenomic in Chapter 6, and adds Example 8.2.22.