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material equivalence

noun, Logic.
1.
equivalence (def 4b).
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Encyclopedia Article for material equivalence

in logic and mathematics, the formation of a proposition from two others which are linked by the phrase "if, and only if." The equivalence formed from two propositions p and q also may be defined by the statement "p is a necessary and sufficient condition for q."

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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