In general, a reference is something that refers to or designates something else, or acts as a connection or a link between two things. The objects it links may be concrete, such as books or locations, or abstract, such as data, thoughts, or memories. The object which is named by a reference, or to which the reference points, is the referent.
The term reference is used with different specialized meanings in a variety of fields, as follows:
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Reference :: Science

Digital Library of Mathematical Functions - This mockup gives an idea of the current ideas about the design and organization of the new Digital Library; these ideas are, of course, subject to change. Content only is only available in a few places.
Geometry Formulas and Facts - An excerpt from the 30th Edition of the CRC Standard Mathematical Tables and Formulas, covering the area of Geometry (minus differential geometry), by Silvio Levy.
Glossary of Math Terms - Explains commonly used words specialized to this field. Includes examples and some graph illustrations.
Meta Description: [ 20 educational technology projects to share $1.9 million
, ]
Math Assistance - Lists rules and formulas for a number of mathematical subjects, such as plotting graphics, functions, factoring, derivatives, integrals, matrices, vectors, and numerical analysis. In English, French and Turkish languages.
Meta Description: [ A vaste collection of math course and exercises at all levels ]
500
Math Tables, Facts and Formulas - A mathematics reference collection of K through 14 math tables, facts, definitions, formulas and explanations: compiled by Colby Community College Mathematics Department.
Math2.Org - Formerly Dave's Math Tables. Mathematical tables on-line and downloadable.
Mathematical Atlas - A topical guide to modern mathematics that explains the subdisciplines. Includes graphics that represent their relative size and relationship.
Meta Description: [ The Mathematical Atlas: A gateway to the areas of modern mathematics and to resources for those areas ]
Mathematics Resources - This site comprises a large number of links to matheamtical resources, dedicated to various topics.
Meta Description: [ Hand picked directory of online Mathematics resources ]
Numbers and Numerical Prefixes - Tables for Greek and Latin number values alone and as a part of other words.
Meta Description: [ Nothing to see here - The Phrontistery has moved ]
On-Line Encyclopedia of Integer Sequences - Identify a sequence by entering few terms in the sequence. Additional information includes examples, formulas, and related links.
500
PlanetMath - A collaborative encyclopaedia with entries contributed under the GNU Free Documentation License.
Platonic Realms - Online resource for the mathematics community: links library, bookstore, quotes, and online articles.
Meta Description: [ Mathematics resources for students and instructors. ]
Summation Formulae - For polynomials of degrees up to 50, generated using the Euler-Maclaurin method.
500
The Abacus - Articles on the history, techniques, and construction of the abacus, with interactive Java Applet.
The Math Reference Project - An electronic archive of articles by Karl Dahlke on topics ranging from high school geometry up to graduate level topology.
Wikipedia: Mathematics Section - Free encyclopedia. Cover number systems, different math fields, foundations, history, applications, and famous problems.
Wolfram: Mathematical Functions - Includes advanced formulas and visualizations of various equation, such as elliptical curves.
Meta Description: [ The Wolfram Functions Site - Providing
the mathematical and scientific community with the world's largest
collection of formulas and graphics about mathematical functions. ]
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