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The Organon is a collection of six works by Aristotle that form the foundation of Western logic. Aristotle viewed logic not as a theoretical science, but as a crucial "tool" (organon) for all other sciences.123

The six works within the Organon are:
* Categories: Discusses ten basic kinds of entities.13
* On Interpretation: Covers semantics and the structure of propositions.13
* Prior Analytics: Details the theory of syllogistic reasoning.13
* Posterior Analytics: Presents Aristotle's theory of scientific demonstration.13
* Topics: Explores nondemonstrative reasoning and argumentation.13
* Sophistic Refutations: Analyzes various types of logical fallacies.13

Aristotle's logic was groundbreaking, introducing the use of variables and a systematic approach to reasoning that influenced philosophical thought for centuries.13

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