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The condition of being equivalent or essentially equal.
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An equivalence relation; ≡; ~
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The relationship between two propositions that are either both true or both false.
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The quantity of the combining power of an atom, expressed in hydrogen units; the number of hydrogen atoms can combine with, or be exchanged for; valency.
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A Boolean operation that is TRUE when both input variables are TRUE or both input variables are FALSE, but otherwise FALSE; the XNOR function.
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A number in intersection theory. A positive-dimensional variety sometimes behaves formally as if it were a finite number of points; this number is its equivalence.
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The degree to which a term or text in one language is semantically similar to its translated counterpart.