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Graph the function.
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Subcontrary Propositions
In traditional logic, propositions that cannot both be false but can both be true.
Existential Import
The assumption within a statement that asserts the existence of the subject matter it mentions.
Affirmative Subalternate
A proposition that is universally affirmative, implying a particular affirmative proposition as well.
Subcontraries
In the traditional square of opposition, a pair of propositions that, in virtue of their logical form, could both be true but could not both be false (I and O).
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