Robert P. Munafo, 1999 Feb 2.
1. A type of number that is a superset of the rational numbers, allowing any possible infinite sequence of decimal digits, or any possible infinite continued fraction. Treated as a set, the real numbers constitute a continuum and can be thought of as being points on a line.
2. Referring to the component of a complex number that is a real number, as opposed to the imaginary component.
From the Mandelbrot Set Glossary and Encyclopedia, by Robert Munafo, (c) 1987-2022. Mu-ency index
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