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- Proof by counterexample is a proof structure that allows us to prove that a property is not true by providing an example where it does not hold1. It is a way of showing that a given statement cannot possibly be correct by showing an instance that contradicts a universal statement2. For example, to prove that not all triangles are obtuse, we can give the following counterexample: the equilateral triangle having all angles equal to sixty1. In this case, there are infinitely many counterexamples1.Learn more:✕This summary was generated using AI based on multiple online sources. To view the original source information, use the "Learn more" links.This proof structure allows us to prove that a property is not true by pro-viding an example where it does not hold. For example, to prove that not all triangles are obtuse", we give the following counter example: the equilateral triangle having all angles equal to sixty. In this case, there are in nitely many counterexample.www.math.toronto.edu/writing/Counterexample.pdfA 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. For example, if you are trying to prove the statement "All cheesecakes are baked in Alaska."en.wikibooks.org/wiki/Mathematical_Proof/Methods…
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