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 like "-A" but where the "-" has a small vertical line hanging from its right-hand end (LaTeX \neg). In the C programming language, it is "!".
(24 Jan 1995)