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an identity?

maybe a tautology?

Comment by mgately:

In the field of discrete mathematics (simplified the study of logic) any expression which always evaluates to true is in fact called a tautology. While less cool sounding, an expression which always evaluates to false is just called a contradiction.

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โˆ™ 2011-05-02 02:39:22
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Q: What is it called when there is an equation that is always true?
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