*Forma,* Vol. 13 (No. 2), pp. 133-136, 1998

*Letter*

## A Configuration of Random Points on a Sphere Generated by Central Symmetric Density

Yoshiaki Itoh

The Institute of Statistical Mathematics and the Graduate University for Advanced Studies, 4-6-7 Minami-Azabu Minato-ku, Tokyo 106, Japan

(Received March 31, 1993; Accepted June 14, 1994)

**Keywords: **
Probability of Configuration, Random Symplex, Separation by Hyperplane

**Abstract. **
We consider *N* + 2 points mutually independently distributed on a sphere of *N*-dimension. We calculate the probability of a configuration of the *N* + 2 points on the sphere. The probability is (1/2)^{N+1} which does not depend on the particular choice of the underlying distribution as long as it is central symmetric.