Editing Simple group (section)

=== Classification ===
The full classification is generally accepted as beginning with the [[Feit–Thompson theorem]] of 1962–1963 and being completed in 2004.

Soon after the construction of the Monster in 1981, a proof, totaling more than 10,000 pages, was supplied in 1983 by Daniel Gorenstein, that claimed to successfully [[List of finite simple groups|list all finite simple groups]]. This was premature, as gaps were later discovered in the classification of [[quasithin group]]s. The gaps were filled in 2004 by a 1300 page classification of quasithin groups and the proof is now generally accepted as complete.