A level set in two dimensions. Phase curves are sometimes also known as level curves (Tabor 1989, p. 14).
Level Curve
See also
Contour Plot, Equipotential Curve, Level Surface, Phase CurveExplore with Wolfram|Alpha
References
Tabor, M. Chaos and Integrability in Nonlinear Dynamics: An Introduction. New York: Wiley, 1989.Referenced on Wolfram|Alpha
Level CurveCite this as:
Weisstein, Eric W. "Level Curve." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/LevelCurve.html