sporadic simple group

sporadic simple group

[spə¦rad·ik ¦sim·pəl ‚grüp]
(mathematics)
A simple group which cannot be classified in any known infinite family of simple groups.
References in periodicals archive ?
Among the topics are the classifying space and cohomology of Thompson's sporadic simple group, the Schur indices of cuspidal unipotent characters, analyzing ovals in finite projective planes using the representation theory of the symmetric group, and regular orbits of induced modules of finite groups.