Logical Operation

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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).


References in periodicals archive ?
Notably, all input characters (from [T.sub.C] and [W.sub.CS]) were padded to 16-bit Unicode values, ensuring that logical operations (like ADD during the DAC stage or in the last/AND stage between [W.sub.KG1] and [T.sub.C]) result with no loss in the 17-bit results generated.
The primary aim is then to analyze their behavior with respect to the fundamental logical operations. This may be done by studying intensional model structures (intensional structures, for short).
To minimize logical operations, these tests are performed on one side at a time.
Deutsch and a number of collaborators gradually refined these ideas, and they established that a quantum computer could perform certain logical operations that a conventional computer cannot.
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Conway: I think there are four key risks we must be aware of across the value chain: The ever-growing use of open source software; the impact of increasing reliance on the integrity of third party cloud platforms; deploying far too many security solutions without a single, integrated architecture; and the risk of addressing cyber in isolation, without a comprehensive approach to physical, logical operations, and information security.
d) Ultralightweight protocols can incorporate only simple bitwise logical operations and even pseudorandom number generators cannot be used at the tag's side.
He explores Badiou's truth and ethics, Derrida's thoughts on the limits of language, the politicization of math in Badiou's Being and Event, and Derrida's interest in supplementation and deviation in logical operations.
And just like silicon-based logic gates, these biological gates allow for both information storage and logical operations.