Cross Polytope
A regular Polytope in 
-D (generally assumed to satisfy 
) corresponding to the Convex Hull ofthe points formed by permuting the coordinates (
, 0, 0, ..., 0). It is denoted 
and hasSchläfli Symbol 
. In 3-D, the cross polytope is the Octahedron.
- Archimedean Spiral
- Archimedean Spiral Inverse Curve
- Archimedean Valuation
- Archimedes Algorithm
- Archimedes' Axiom
- Archimedes' Cattle Problem
- Archimedes' Circles
- Archimedes' Constant
- Archimedes' Hat-Box Theorem
- Archimedes' Lemma
- Archimedes' Midpoint Theorem
- Archimedes' Postulate
- Archimedes' Problem
- Archimedes' Recurrence Formula
- Archimedes' Spiral
- Archimedes' Spiral Inverse
- Arc Length
- Arc Minute
- Arcsecant
- Arc Second
- Arcsine
- Arctangent
- Area
- Area Element
- Areal Coordinates