Principle of contradiction

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(Logic)

the axiom or law of thought that a thing cannot be and not be at the same time, or a thing must either be or not be, or the same attribute can not at the same time be affirmed and and denied of the same subject; also called the law of the excluded middle.

See also: Contradiction

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Logical impossibility

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Principiant
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principium
principle
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principle of indifference
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