logical operation

also logic operationn. An instruction in which the quantity being operated on and the results of the operation can each have two values. Logical operations include AND, OR, NAND, XOR, and NOR.

logical operation

n (Computer Science) computing an operation involving the use of logical functions, such as and or or, that are applied to the input signals of a particular logic circuit

Thesaurus

Noun

logical operation - an operation that follows the rules of symbolic logiclogic operationlogic - the branch of philosophy that analyzes inferenceoperation - (computer science) data processing in which the result is completely specified by a rule (especially the processing that results from a single instruction); "it can perform millions of operations per second"

Logical Operation

in a digital computer, a digit-by-digit operation on codes of random length according to the rules of algebraic logic. The same logical operation is performed on all digits of the code, and each digit of the result depends on not more than one digit of one or more codes. In digital computers, logical operations are usually performed on binary codes.

The basic and most common logical operations are the operations of negation, conjunction, disjunction, and equivalence. These operations may be performed relatively simply by the physical elements of the digital computer; more complex operations may be reduced by a program to, for example, three logical operations: negation, conjunction, and disjunction. Examples of the use of logical operations are as follows: for negation, the inversion or conversion of a direct representation into a ones complement or a true complement; for conjunction, logical multiplication to isolate any part of the code; for disjunction, logical addition when forming new comments from several other comments; for equivalence, equivalence when determining the step-by-step identity of codes. Logical operations also often include shifts, equal-to-zero checks, sign checks, and finding the absolute value of a number. In general-purpose digital computers, logical operations provide control of the execution of programs, mutual connection of programs, and the formation of new instructions, recoding data, and information retrieval according to logical criteria. Logical operations are the basis for building specialized logical digital machines for solving problems in the analysis of switching circuits to optimize them, and also problems of synthesis (that is, the assembly and selection of elementary circuits, by means of which more complex circuits can be built to perform given functions).

A. V. GUSEV

logical operation