quadratic surd

quadratic surd

[kwä′drad·ik ‚sərd]
(mathematics)
A square root of a rational number that is itself an irrational number.
References in periodicals archive ?
Such continued fractions are called periodic, and a continued fraction is periodic if and only if it represents a quadratic surd.
Binary sequences derived from quadratic surds manifest another dimension of self-similarity.
The high degree of regularity produced in the binary sequence determined by [-square root of 2] is a reflection of the periodicity of its continued fraction representation, a property shared by all quadratic surds.