Proof by Contradiction
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More Lessons for High School Regents Exam
Math Worksheets
High School Math based on the topics required for the Regents Exam conducted by NYSED.
How to Proof by Contradiction (also called Indirect Proof)?
Suppose we want to prove S
1. Assume not S.
2. Try to find a contradiction by the implications of not S. (Show that not S is false)
3. If we find a contradiction then we can accept S to be true since not S is false.
Proof by Contradiction
Proof that \(\sqrt 2 \) is irrational
In this lesson, you'll learn how to write indirect proofs, or proofs by contradiction, by assuming a hypothesis is false.
This video shows how to work step-by-step through two examples in Indirect Proof.
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