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Additional
Sheffer stroke
English Wikipedia - The Free Encyclopedia
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Sheffer stroke
In
Boolean functions
and
propositional calculus
, the
Sheffer stroke
, named after
Henry M. Sheffer
, written "|" (see
vertical bar
, not to be confused with "||" which is often used to represent
disjunction
), "D
pq
", or "↑" (an upwards arrow), denotes a
logical operation
that is equivalent to the
negation
of the
conjunction
operation, expressed in ordinary language as "not both". It is also called
nand
("not and") or the
alternative denial
, since it says in effect that at least one of its operands is false. In
Boolean algebra
and
digital electronics
it is known as the
NAND operation
.
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