Answer for a younger audience: http://standards.nctm.org/document/chapter3/rep.htm Answer for Unviersity level mathematicians: http://en.wikipedia.org/wiki/Representation_(mathematics)
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In mathematics, a variable is a representation, in the form of a letter, of a numerical value. Variables are traditionally used when the value it represents is either unknown or can vary.
In mathematics, representation is a very general relationship that expresses a collection Y of mathematical objects may be said to represent another collection.
Repeating decimals consist of a fixed string of digits which repeat infinitely in the decimal representation of a number. These may start anywhere after a finite number of digits.
Mathematics"mathematics" is a plural noun already, the subject is Mathematics!
mathematics