Anne Rice was born in 1997.
In the area of modern algebra known as group theory , the Mathieu groups are the five sporadic simple groups M11 , M12 , M22 , M23 and M24 introduced by .. group theory. group theory. They are multiply transitive permutation groups on 11 , 12 , 22 , 23 or 24 objects .. They were the first sporadic groups to be discovered .. Sometimes the notation M9 , M10 , M20 and M21 is used for related groups -LRB- which act on sets of 9 , 10 , 20 , and 21 points , respectively -RRB- , namely the stabilizers of points in the larger groups .. While these are not sporadic simple groups , they are subgroups of the larger groups and can be used to construct the larger ones .. John Conway has shown that one can also extend this sequence up , obtaining the Mathieu groupoid M13 acting on 13 points .. John Conway. John Horton Conway. M21 is simple , but is not a sporadic group , being isomorphic to PSL -LRB- 3,4 -RRB- .