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Real number

172 bytes added, 19:37, 15 August 2008
fixing misconception--please see talk
'''Real numbers''' are numbers that can be represented by some infinite or finite [[decimal]] representation, such as 0.707106781187...
They are called The term "realnumber" exists for historical reasons; it was once thought that such numbers " because they actually exist as quantities in " existed (hence the word "real world"), i.e. as measures, weights, temperatures. In in contrast, to the supposed non-existence of [[imaginary number]]s are just an abstract concept. However, but advances in [[complex analysis]] in the 19th century revealed that imaginary numbers do not exist concretely , in fact, exist, and the terminology of "real world" and "imaginary" is now understood to be just that--terminology.
In classical physics, measurements of things that can vary smoothly and continuously, like [[speed]] or [[temperature]], are treated as real numbers.