Sheffer's stroke

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

Word Origin for Sheffer's stroke

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

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