In boolean algebra, the logical complement or negation of a Boolean value is the opposite value, given by the following truth table: A | -A
--+---
T | F
F | T -A is also written as A with a bar over it or with a small vertical line hanging from the right-hand end of the "-" (latex \neg) or as A'. In the c programming language, it is !A and in digital circuit design, /A. |