A transformation in which coordinates in two spaces are expressed rationally in terms of those in another.
Birational Transformation
See also
Riemann Curve Theorem, Weber's TheoremExplore with Wolfram|Alpha
Cite this as:
Weisstein, Eric W. "Birational Transformation." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/BirationalTransformation.html