Sheffer's stroke


noun
  1. 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

Origin of Sheffer's stroke

1
named after H. M. Sheffer (1883–1964), US philosopher

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