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(computer science)
A computer operation in which two numbers are compared as to identity, relative magnitude, or sign.



comparing a gauge or quantity to be measured with a quantity that is reproducible in the measuring process.

Comparisons are made by instruments such as the equal-arm balance, the electric potentiometer, the photometer bench with a photometer, and the comparator for linear standards.



an act of thought by means of which the content of being and cognition is classified, ordered, and evaluated; in comparison, the world is understood to be “coherent” diversity. The act of comparison consists of the pairing of objects for the purpose of clarifying their relationship. Essential to this are the conditions, or bases, of comparison—the attributes that determine precisely what the possible relationships are between objects.

Comparison has meaning only in an aggregate of “homogeneous” objects that form a class. The comparability of objects in a class (tertium comparationis) is realized in terms of the attributes essential for a particular examination; objects comparable in terms of one basis may be incomparable in terms of another. For example, all people are comparable in terms of age, but not all are comparable with respect to “being older.”

The simplest and most important type of relationships revealed by means of comparison are the relationships of identity (equality) and difference. Comparison of this type leads in turn to the concept of universal comparability, that is, the notion that it is always possible to answer the question of whether objects are identical or different. Objects of visual experience are always comparable, although the condition of visibility, or observability, is a significant restriction. In theory, the visual comparison of objects is often impossible, and to compare objects it is necessary to resort to inferences and, eventually, to certain abstractions from which the inferences have been deduced. The supposition of universal comparability is therefore sometimes called the abstraction of comparability. As a rule, the abstraction of comparability is a nontrivial hypothesis and is valid within the framework and on the basis of the main principles of theory.

M. M. NOVOSELOV [24–1047–1; updated]

References in periodicals archive ?
Tools for data analysis, manipulation, and visualization for comparative studies will also be provided.
The objective of the WLRL is to provide a common, instrumented facility for students and members to analyze both the theoretical and real-world performance of products to provide an instrumented, controlled environment for analysis, and conduct comparative studies as desired," explained Professor Pahlavan.
to offer an International Comparative Studies in Japanese and American Architecture course, enabling the students at both universities to collaborate more actively than ever before.
The Pension Debate Information Center includes research papers, fact sheets, CalPERS documents, and comparative studies of defined benefits and defined contribution plans.
This support will enable the center to conduct comparative studies in methodological and organizational aspects of risk management and importantly provide a forum for the exchange of experience and knowledge in these critical areas of business.
Comparative studies have shown that cost savings can be obtained by routinely utilizing FFRmyo to assist in identifying the culprit stenosis via a `tailored' approach in multi-vessel disease.
Both University research programs, headed by: Dennis Tarnow, DDS at NYU and Saul Weiner, DDS at UMDNJ, are also evaluating the newly approved Silhouette Laser-Lok implants in side-by-side comparative studies with competitive products.
At the National Research Council (NRC), Jones served as senior program officer of the board of testing and assessment and director of the board on international comparative studies in education.
After the success of Agilent's Multiple Affinity Removal Column for human serum, researchers have been eager for a corresponding mouse column to achieve equivalent levels of detection for comparative studies.
Each issue of the Journal explores the use of the zebrafish and other aquarium models for comparative studies of gene structure, function and evolution; the cellular and molecular mechanisms of cell growth, differentiation, and gene expression; new strategies to study gene function and embryonic mutations; the use of aquatic models for carcinogenesis, toxicology, infections and immune response; human neurological disorders, and aging; and drug discovery.

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