In February 1981, the classification of the finite simple groups (Dl)*
was completed, t. * representing one of the most remarkable
achievements in the history or mathematics. Involving the combined
efforts of several hundred mathematicians from around the world over a
period of 30 years, the full proof covered something between 5,000 and
10,000 journal pages, spread over 300 to 500 individual papers. The
single result that, more than any other, opened up the field and
foreshadowed the vastness of the full classification proof was the
celebrated theorem of Walter Feit and John Thompson in 1962, which
stated that every finite group of odd order (D2) is solvable (D3)-a
statement expressi- ble in a single line, yet its proof required a full
255-page issue of the Pacific 10urnal of Mathematics [93]. Soon
thereafter, in 1965, came the first new sporadic simple group in over
100 years, the Zvonimir Janko group 1, to further stimulate the 1 'To
make the book as self-contained as possible. we are including
definitions of various terms as they occur in the text. However. in
order not to disrupt the continuity of the discussion. we have placed
them at the end of the Introduction. We denote these definitions by
(DI). (D2), (D3). etc.