Sporadic Group
One of the 26 finite Simple Groups. The most complicated is the Monster Group. A summary, asgiven by Conway et al. (1985), is given below.
| Symbol | Name | Order |  |  |
 | Mathieu |  | 1 | 1 |
 | Mathieu |  | 2 | 2 |
 | Mathieu |  | 12 | 2 |
 | Mathieu |  | 1 | 1 |
 | Mathieu |  | 1 | 1 |
 | Janko |  | 2 | 2 |
| Suz | Suzuki |  | 6 | 2 |
| HS | Higman-Sims |  | 2 | 2 |
| McL | McLaughlin |  | 3 | 2 |
 | Conway |  | 1 | 1 |
 | Conway |  | 1 | 1 |
 | Conway |  | 2 | 1 |
| He | Held |  | 1 | 2 |
 | Fischer |  | 6 | 2 |
 | Fischer |  | 1 | 1 |
 | Fischer |  | 3 | 2 |
| HN | Harada-Norton |  | 1 | 2 |
| Th | Thompson |  | 1 | 1 |
 | Baby Monster |  | 2 | 1 |
| Monster |  | 1 | 1 |
 | Janko |  | 1 | 1 |
| O'N | O'Nan |  | 3 | 2 |
 | Janko |  | 3 | 2 |
| Ly | Lyons |  | 1 | 1 |
| Ru | Rudvalis |  | 2 | 1 |
 | Janko |  | 1 | 1 |
References
Aschbacher, M. Sporadic Groups. New York: Cambridge University Press, 1994. Conway, J. H.; Curtis, R. T.; Norton, S. P.; Parker, R. A.; and Wilson, R. A. Atlas of Finite Groups: Maximal Subgroups and Ordinary Characters for Simple Groups. Oxford, England: Clarendon Press, p. viii, 1985. Math. Intell. Cover of volume 2, 1980. Wilson, R. A. ``ATLAS of Finite Group Representation.''http://for.mat.bham.ac.uk/atlas/html/contents.html#spo.
- Interchange Graph
- Interest
- Interior
- Interior Angle Bisector
- Intermediate Value Theorem
- Internal Bisectors Problem
- Internal Knot
- Interpolation
- Interquartile Range
- Interradius
- Intersection
- Interspersion
- Intersphere
- Interval
- Interval Graph
- Interval Order
- Intrinsically Linked
- Intrinsic Curvature
- Intrinsic Equation
- Invariant
- Invariant Density
- Invariant (Elliptic Function)
- Invariant Manifold
- Invariant Point
- Invariant Subgroup