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identical proposition

noun, Logic.
a proposition in which the subject and predicate have the same meaning, as, “That which is mortal is not immortal.”.
Origin of identical proposition
First recorded in 1635-45 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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British Dictionary definitions for identical proposition

identical proposition

(logic) a necessary truth, esp a categorial identity, such as whatever is triangular has three sides
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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