NOTtoiminto

NOTtoiminto is a Finnish term for the logical NOT operation, a fundamental unary negation used in mathematics, logic and computer science. It inverts a boolean value, turning true into false and false into true.

In boolean algebra, NOT is the complement operation. If a proposition or variable x is true, NOT x is false, and if x is false, NOT x is true. For binary values 0 and 1, NOT 0 equals 1 and NOT 1 equals 0. The operation is often denoted by the symbol ¬ or by a bar over the variable, and it is the basis for more complex logical expressions.

In digital electronics, NOT is implemented as an inverter or NOT gate. The inverter outputs the opposite level of its input; a high voltage may represent true and a low voltage false. In circuit diagrams, NOT gates are standard building blocks for creating more complex logic circuits, and they obey the same negation principle as in boolean algebra.

In programming, the NOT operation is a unary operator that negates a boolean value. In many languages it is written as not or as !, depending on syntax. Some languages also apply truthiness rules to non-boolean values, converting them to boolean before negation. The NOT operator is commonly combined with AND and OR to form more complex conditional logic.

Key properties include involution (NOT NOT x equals x) and its relationship to De Morgan’s laws: NOT (A AND B) equals (NOT A) OR (NOT B), and NOT (A OR B) equals (NOT A) AND (NOT B).

See also: boolean algebra, NOT gate, negation, De Morgan’s laws, truth table.