Are there cases in mathematics where it is easier to define the negation of a property $P$ than property $P$ itself? I would like several answers giving examples of such cases. Basically, I am looking for examples in math texts and papers where the author first defines the negation of a property, then negates the definition to get the property itself.
2026-04-04 07:05:05.1775286305
Examples of cases where it is easier to define the negation of a property than the property itself
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