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  2. In logic, a counterexample disproves a generalization1. For example, the fact that "John Smith is not a lazy student" is a counterexample to the generalization “students are lazy”1. Here are some examples of counterexamples in logic2:
    • All oranges are fruits and all oranges are citrus, so all citrus are fruits.
    • No actors are politicians, so no politicians are insensitive, since no actors are insensitive.
    • Some students are people who shower every day, because some students are people with jobs and some people with jobs shower every day.
    Learn more:

    In logic a counterexample disproves the generalization, and does so rigorously in the fields of mathematics and philosophy. For example, the fact that "John Smith is not a lazy student" is a counterexample to the generalization “students are lazy”, and both are counterexample to, and disproof of, the generalization “all students are lazy.”

    en.wikipedia.org/wiki/Counterexample

    Solutions to Counter-example exercises

    • 1. All oranges are fruits and all oranges are citrus, so all citrus are fruits. Form: ...
    • 2. No actors are politicians, so no politicians are insensitive, since no actors are insensitive. Form: ...
    logic.umwblogs.org/validity/validity-exercises/soluti…
     
  3. People also ask
    What is a counterexample in logic?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.
    What if there are no counter-examples to a particular argument?If there are no counter-examples to a particular argument, then it is valid, as it is then impossible to find a situation in which the premises of the argument are true and the conclusion is false.
    What is a counterexample method?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. Let's take an example of a bad argument.
    What is an example of a counterexample?A counterexample is a specific example for which a statement is untrue. The existence counterexample proves the statement is false, even if it is often, mostly, or almost entirely true. Counterexamples are incredibly important for logic, which is, in turn, important because it provides the foundation for almost all mathematics. This section covers:
     
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    WEBConditional statements are used to accurately describe the world or construct a theory. Counterexamples are statements used to disprove a conditional. Universal statements are statements that assert something …

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  11. Counterexamples | How We Reason | Oxford Academic

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    WEBSep 17, 2014 · There are two broad types of counterexample: propositional and argumentative counterexamples. Gettier cases are an example of propositional counterexamples. Aristotle put forward a proposition, the …

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