An Irrational Number of the form
where and are Integers and is a Squarefree Integer. Quadratic irrational numbers
are sometimes also called Quadratic Surds. In 1770, Lagrange proved that that any
quadratic irrational has a Continued Fraction which is periodic after some point.
See also Continued Fraction, Quadratic Surd
© 1996-9 Eric W. Weisstein
1999-05-25