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A '''contradiction''' is the simultaneous acceptance and denial of a proposition or statement. "It was the best of times and the worst of times" is a, poetic, example: the contradiction being used to enhance the poetic nature of the piece.

A '''contradiction''' is the simultaneous acceptance and denial of a proposition or statement. "It was the best of times and the worst of times" is a poetic example: the contradiction is being used to enhance the poetic nature of the piece.

In a [[proof]], if two contradictory [[inference]]s can be drawn from the [[premise]], this indicates either that a premise is false or that the argument is invalid.

In a [[proof]], if two contradictory [[inference]]s can be drawn from the [[premise]], this indicates either that a premise is false or that the argument is invalid.