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Sheffer's stroke

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noun
logic a function of two sentences, equivalent to the negation of their conjunction, and written p | q (p and q are both not true) where p,q, are the arguments: p | q is false only when p,q are both true. It is possible to construct all truth functions out of this one alone
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Word Origin for Sheffer's stroke

named after H. M. Sheffer (1883–1964), US philosopher
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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