Real Quadratic Field
A quadratic field Q(sqrt(D)) with D>0.
See also
Imaginary Quadratic Field, Quadratic FieldExplore with Wolfram|Alpha
WolframAlpha
More things to try:
Cite this as:
Weisstein, Eric W. "Real Quadratic Field." From MathWorld--A Wolfram Resource. https://mathworld.wolfram.com/RealQuadraticField.html