a number wich disproves a proposition For example, theprime number 2 is a counterexample to the statement "All prime numbers are odd."
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A counterexample.
Counterexample
a number wich disproves a proposition For example, theprime number 2 is a counterexample to the statement "All prime numbers are odd."
non-example, counterexample,
There is no counterexample because the set of whole numbers is closed under addition (and subtraction).