Hyperbolic Octahedron
A hyperbolic version of the Euclidean Octahedron, which is a special case of the Astroidal Ellipsoid with
. It is given by the parametric equations
 |  |  | |
 | |  | |
 | |  |
for
and 
.See also Astroidal Ellipsoid, Hyperbolic Cube, Hyperbolic Dodecahedron, Hyperbolic Tetrahedron
References
Gray, A. Modern Differential Geometry of Curves and Surfaces. Boca Raton, FL: CRC Press, pp. 305-306, 1993. Nordstrand, T. ``Astroidal Ellipsoid.'' http://www.uib.no/people/nfytn/asttxt.htm.
Rivin, I. ``Hyperbolic Polyhedron Graphics.''http://www.mathsource.com/cgi-bin/MathSource/Applications/Graphics/3D/0201-788.
- Arcsecant
- Arc Second
- Arcsine
- Arctangent
- Area
- Area Element
- Areal Coordinates
- Area-Preserving Map
- Area Principle
- Arf Invariant
- Argand Diagram
- Argand Plane
- Argoh's Conjecture
- Argument Addition Relation
- Argument (Complex Number)
- Argument (Elliptic Integral)
- Argument (Function)
- Argument Multiplication Relation
- Argument Principle
- Argument Variation
- Aristotle's Wheel Paradox
- Arithmetic
- Arithmetic-Geometric Mean
- Arithmetic Geometry
- Arithmetic-Harmonic Mean