A plane curve is a curve that lies in a single plane. A plane curve may be closed or open. Curves which are interesting for some reason and whose properties have therefore been investigates are called "special" curves (Lawrence 1972). Some of the most common open curves are the line, parabola, and hyperbola, and some of the most common closed curves are the circle and ellipse.
Uncensored Doujin Batch - Chapter 5
Phase Portrait -- from Wolfram MathWorld
What isthe Jordan curve theorem?
A Topological and Dynamical Approach to the Study of Complex
Cruciform -- from Wolfram MathWorld
Sphere-Sphere Intersection - From Wolfram MathWorld, PDF
Curve Article about curve by The Free Dictionary
Solved If you could answer this question using WOLFRAM
Trefoil Curve -- from Wolfram MathWorld
Axioms, Free Full-Text
Walking On A Curve In Unity, Helix Version
Planar curves - Math Central