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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 to an argument form?An counterexample to an argument form is a substitution instance whose premises are true and whose conclusion is false. If there are Beefsteaks in Dan’s summer garden, then there are tomatoes in it. There are no Beefsteaks in Dan’s summer garden. So, 3. There are no tomatoes in Dan’s summer garden.
    What is a counterexample to a sentence logic argument?A Counterexample to a sentence logic argument is an assignment of truth values to sentence letters which makes all of the premises true and the conclusion false. An argument is Valid just in case there are no counterexamples to it. Now let us reexpress an of this using sentences of sentence logic and the idea of logical truth.
    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:
    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.
     
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