Circular Reasoning

Circular reasoning assumes the conclusion inside the premises. The argument goes in a circle: it proves nothing because it started with what it wanted to show.

Example

"This book is trustworthy because it says so in the book" assumes the book’s trustworthiness.

See also

• Assumption
• Flaw in the Reasoning
• Valid Argument

Back to the full glossary

Last updated October 12, 2026