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- A proof by counterexample is a way of showing that a given statement cannot possibly be correct by showing an instance that contradicts a universal statement12. Such an example is called a counterexample because it's an example that counters, or goes against, the statement's conclusion1. Counterexamples are often used to prove the boundaries of possible theorems3. By using counterexamples to show that certain conjectures are false, mathematical researchers can then avoid going down blind alleys and learn to modify conjectures to produce provable theorems3.Learn more:✕This summary was generated using AI based on multiple online sources. To view the original source information, use the "Learn more" links.Showing that a mathematical statement is true requires a formal proof. However, showing that a mathematical statement is false only requires finding one example where the statement isn't true. Such an example is called a counterexample because it's an example that counters, or goes against, the statement's conclusion.www.khanacademy.org/test-prep/praxis-math/praxi…A proof by counterexample is not technically a proof. It is merely a way of showing that a given statement cannot possibly be correct by showing an instance that contradicts a universal statement.en.wikibooks.org/wiki/Mathematical_Proof/Methods…In mathematics, counterexamples are often used to prove the boundaries of possible theorems. By using counterexamples to show that certain conjectures are false, mathematical researchers can then avoid going down blind alleys and learn to modify conjectures to produce provable theorems.en.wikipedia.org/wiki/Counterexample
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