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An Integer which is expressible in more than one way in the form $x^2+Dy^2$ or $x^2-Dy^2$ where $x^2$ is Relatively Prime to $Dy^2$. If the Integer is expressible in only one way, it is called a Monomorph.

See also Antimorph, Idoneal Number, Monomorph

© 1996-9 Eric W. Weisstein