20XX 


Group theory and generalizations 


2000 
General reference works (handbooks, dictionaries, bibliographies, etc.) 


2001 
Instructional exposition (textbooks, tutorial papers, etc.) 


2002 
Research exposition (monographs, survey articles) 


2003 
Historical (must also be assigned at least one classification number from Section 01) 


2004 
Explicit machine computation and programs (not the theory of computation or programming) 


2006 
Proceedings, conferences, collections, etc. 

20Axx 

Foundations 

20Bxx 

Permutation groups 

20Cxx 

Representation theory of groups [See also 19A22 (for representation rings and Burnside rings)] 

20Dxx 

Abstract finite groups 

20Exx 

Structure and classification of infinite or finite groups 

20Fxx 

Special aspects of infinite or finite groups 

20Gxx 

Linear algebraic groups (classical groups) {For arithmetic theory, see 11E57, 11H56; for geometric theory, see 14Lxx, 22Exx; for other methods in representation theory, see } 

20Hxx 

Other groups of matrices [See also 15A30] 

20Jxx 

Connections with homological algebra and category theory 

20Kxx 

Abelian groups 


20L05 
Groupoids (i.e. small categories in which all morphisms are isomorphisms) {For sets with a single binary operation, see 20N02; for topological groupoids, see 22A22, 58H05} 

20Mxx 

Semigroups 

20Nxx 

Other generalizations of groups 


20P05 
Probabilistic methods in group theory [See also 60Bxx] 