How did Aristotle contribute to the formal study of fallacies?

Aristotle established the formal study of fallacies, marking one of the oldest branches of logic. His primary contribution is found in his work Sophistic Refutations, which provides a systematic catalog of various fallacies and strategies for identifying or avoiding them.12

Aristotle categorized fallacies into two main types:

• Verbal fallacies: He identified six types stemming from misleading linguistic forms, including equivocation, amphiboly, combination or division of words, accent, and form of expression.3
• Nonverbal fallacies: These include the fallacy of accident, the fallacy of secundum quid, and "ignorance of refutation," which involves a misunderstanding of what is being proved or disproved.4

Additionally, Aristotle is associated with the fallacy of the consequent, which involves errors in conditional reasoning, such as the denial of the antecedent or the affirmation of the consequent. Many of the fallacies he identified remain foundational to introductory logic and reasoning today.51