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Subalternates
In the traditional square of opposition, the relationship between a universal and a particular proposition of the same quality (A and I, E and O): if the universal is true, the particular must be true, and if the particular is false, the universal must be false.
Universal
Pertaining to a statement or concept that applies to all cases or instances without exception.
Particular
In logic, a particular statement is one that claims the existence of at least one instance of something, often contrasted with universal statements that claim something about all instances.
Contrary Propositions
In logic, contrary propositions are pairs of statements that cannot both be true at the same time, but can both be false.
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