Cruciform
A plane curve also called the Cross Curve and Policeman on Point Duty Curve (Cundy and Rollett 1989).It is given by the equation
 | (1) |
 | (2) |
 | (3) |
 | (4) |
 |  |  | (5) |
 | |  | (6) |
The Curvature is
 | (7) |
References
Cundy, H. and Rollett, A. Mathematical Models, 3rd ed. Stradbroke, England: Tarquin Pub., p. 71, 1989. Lawrence, J. D. A Catalog of Special Plane Curves. New York: Dover, pp. 127 and 130-131, 1972.
- Magic Constant
- Magic Cube
- Magic Geometric Constants
- Magic Graph
- Magic Hexagon
- Magic Labeling
- Magic Number
- Magic Series
- Magic Square
- Magic Star
- Magic Tour
- Mahler-Lech Theorem
- Mahler's Measure
- Mainardi-Codazzi Equations
- Majorant
- Major Axis
- Major Triangle Center
- Makeham Curve
- Malfatti Circles
- Malfatti Points
- Malfatti's Right Triangle Problem
- Malfatti's Tangent Triangle Problem
- Malliavin Calculus
- Mallow's Sequence
- Malmstén's Differential Equation