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- To write a counterexample, you need to find a specific case when a statement is wrong and show how the case disproves the statement1. Here are the steps to write a counterexample2:
- Isolate the argument form.
- Construct an argument with the same form that is obviously invalid. This is the counterexample.
Learn more:✕This summary was generated using AI based on multiple online sources. To view the original source information, use the "Learn more" links.Writing a counterexample requires finding a specific case when a statement is wrong and showing how the case disproves the statement. When showing that a statement is false, it is necessary to use a specific example. As an illustration, rather than saying “this is untrue for negative numbers,” one would say, “this is untrue for − 2.www.storyofmathematics.com/counterexample/The "counterexample method" is a powerful way of exposing what is wrong with an argument that is invalid. If we want to proceed methodically, there are two steps: 1) Isolate the argument form; 2) Construct an argument with the same form that is obviously invalid. This is the counterexample.www.thoughtco.com/prove-argument-invalid-by-co…To give a counterexample, we need to find the square of an integer such that it is divisible by 4 Let's try with 6! 62 6 2 is divisible by 4 but 6 is not divisible by 4 Thus n = 6 is a counterexample to Jim's statement. ∴ ∴ n = 6 is the counterexamplewww.cuemath.com/data/counterexample/To give a counterexample, I have to find an integer n such n2is divisible by 4, but n is not divisible by 4 — the “if” part must be true, but the “then” part must be false. Consider n = 6. Then n2= 36 is divisible by 4, but n = 6 is not divisible by 4. Thus, n = 6 is a counterexample to the statement. On the other hand, consider n = 5.sites.millersville.edu/bikenaga/math-proof/countere… - People also ask
Counterexample – Explanation and Examples - The Story of …
A counterexample is a specific instance for which a given statement is false. In formal logic, a statement is “false” if it is not true in every single circumstance. Even if it is usually true or sometimes true, it is false. For this reason, finding even one case where the statement is false makes it false. … See more
Writing a counterexample requires finding a specific case when a statement is wrong and showing how the case disproves the statement. When showing that a … See more
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Counterexamples | Lesson (article) | Lessons | Khan Academy
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WEBDefinition: Counterexample. Example \ (\PageIndex {1}\) Sometimes we want to prove that \ (P \not\Rightarrow Q\text {;}\) i.e. that \ (P \rightarrow Q\) is not a tautology. Recall. The …
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