Pariah group
In the area of modern algebra known as group theory, the term pariah was introduced by Griess (1982) to refer to the six sporadic simple groups which are not subquotients of the monster group.
The twenty groups which are subquotients, including the monster group itself, he dubbed the happy family.
For example, the orders of J4 and the Lyons Group Ly are divisible by 37. Since 37 does not divide the order of the monster, these cannot be subquotients of it; thus J4 and Ly are pariahs. Four other sporadic groups were also shown to be pariahs. The complete list is shown below.
Group | Size | Factorized order |
---|---|---|
Lyons group Ly | ≈5×1016 | 28 • 37 • 56 • 7 • 11 • 31 • 37 • 67 |
O'Nan group O'N | ≈5×1011 | 29 • 34 • 5 • 73 • 11 • 19 • 31 |
Rudvalis group Ru | ≈1×1011 | 214 • 33 • 53 • 7 • 13 • 29 |
Janko group J4 | ≈9×1019 | 221 • 33 • 5 • 7 • 113 • 23 • 29 • 31 • 37 • 43 |
Janko group J3 | ≈5×107 | 27 • 35 • 5 • 17 • 19 |
Janko group J1 | ≈2×105 | 23 • 3 • 5 • 7 • 11 • 19 |
References
- Griess, Robert L. (February 1982), "The friendly giant" (PDF), Inventiones Mathematicae, 69 (1): 1–102, doi:10.1007/BF01389186, ISSN 0020-9910, MR 0671653
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