19L20 $J$-homomorphism, Adams operations [See also <a href="#code:55Q50">55Q50</a>]

19L41 Connective $K$-theory, cobordism [See also <a href="#code:55N22">55N22</a>]

19L50 Twisted $K$-theory; differential $K$-theory

19L99 None of the above, but in this section

19Mxx Miscellaneous applications of $K$-theory

19M05 Miscellaneous applications of $K$-theory

19M99 None of the above, but in this section

20-00 General reference works (handbooks, dictionaries, bibliographies, etc.)

20-01 Instructional exposition (textbooks, tutorial papers, etc.)

20-02 Research exposition (monographs, survey articles)

20-03 Historical (must also be assigned at least one classification number from Section 01)

20-04 Explicit machine computation and programs (not the theory of computation or programming)

20-06 Proceedings, conferences, collections, etc.

20A05 Axiomatics and elementary properties

20A10 Metamathematical considerations {For word problems, see <a href="#code:20F10">20F10</a>}

20A15 Applications of logic to group theory

20A99 None of the above, but in this section

20B07 General theory for infinite groups

20B22 Multiply transitive infinite groups

20B25 Finite automorphism groups of algebraic, geometric, or combinatorial structures [See also <a href="#code:05Bxx">05Bxx</a>, <a href="#code:12F10">12F10</a>, <a href="#code:20G40">20G40</a>, <a href="#code:20H30">20H30</a>, <a href="#code:51-XX">51-XX</a>]

20B27 Infinite automorphism groups [See also <a href="#code:12F10">12F10</a>]

20B99 None of the above, but in this section

20Cxx Representation theory of groups [See also <a href="#code:19A22">19A22</a> (for representation rings and Burnside rings)]

20C05 Group rings of finite groups and their modules [See also <a href="#code:16S34">16S34</a>]

20C07 Group rings of infinite groups and their modules [See also <a href="#code:16S34">16S34</a>]

20C08 Hecke algebras and their representations

20C10 Integral representations of finite groups

20C11 $p$-adic representations of finite groups

20C12 Integral representations of infinite groups