When1: 1913
Who: Henry M. Sheffer [Sheffer, Henry M.]
What: mathematician
Where: USA
works\ Set of Five Independent Postulates for Boolean Algebras, with application to logical constants [1913]
Detail: He lived 1883 to 1964. Elements {Sheffer stroke element} can equal "Not AND" and fire if either, but not both, of two input elements fire. Sheffer-stroke-element combinations can make OR element, AND element, and NOT element. Using many Sheffer stroke elements creates devices whose output fires if and only if most inputs fire.
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Date Modified: 2022.0224