05-XX Combinatorics,

• 05-00 General reference works (handbooks, dictionaries, bibliographies, etc.)
• 05-01 Instructional exposition (textbooks, tutorial papers, etc.)
• 05-02 Research exposition (monographs, survey articles)
• 05-03 Historical (must be assigned at least one classification number from 01-XX)
• 05-04 Explicit machine computation and programs (not the theory of computation or programming)
• 05-06 Proceedings, conferences, collections, etc.
• 05Axx Classical combinatorial problems
• 05Bxx Designs and configurations, {For applications of design theory, see 94C30}
• 05Cxx Graph theory, {For applications of graphs, see 68Q90, 68R10, 90C35, 94C15}
• 05Dxx Extremal combinatorics
• 05Exx Algebraic combinatorics