11-00 General reference works (handbooks, dictionaries, bibliographies, etc.)
11-01 Instructional exposition (textbooks, tutorial papers, etc.)
11-02 Research exposition (monographs, survey articles)
11-03 Historical (must also be assigned at least one classification number from Section 01)
11-04 Explicit machine computation and programs (not the theory of computation or programming)
11-06 Proceedings, conferences, collections, etc.
11Axx Elementary number theory {For analogues in number fields, see 11R04}
11Bxx Sequences and sets
11Cxx Polynomials and matrices
11Dxx Diophantine equations [See also 11Gxx, 14Gxx]
11Exx Forms and linear algebraic groups [See also 19Gxx] {For quadratic forms in linear algebra, see 15A63}
11Fxx Discontinuous groups and automorphic forms [See also 11R39, 11S37, 14-XX, 14Gxx, 14Kxx, 22Exx, 22E50, 22E55, 30F35, 32Nxx] {For relations with quadratic forms, see 11E45}
11Gxx Arithmetic algebraic geometry (Diophantine geometry) [See also 11Dxx, 14-XX, 14Gxx, 14Kxx]
11Hxx Geometry of numbers {For applications in coding theory, see 94B75}
11Jxx Diophantine approximation, transcendental number theory [See also 11K60]
11Kxx Probabilistic theory: distribution modulo $1$; metric theory of algorithms
11Lxx Exponential sums and character sums {For finite fields, see 11Txx}
11Mxx Zeta and $L$-functions: analytic theory
11Nxx Multiplicative number theory
11Pxx Additive number theory; partitions
11Rxx Algebraic number theory: global fields {For complex multiplication, see 11G15}
11Sxx Algebraic number theory: local and $p$-adic fields
11Txx Finite fields and commutative rings (number-theoretic aspects)
11Uxx Connections with logic
11Yxx Computational number theory [See also 11-04]
11Z05 Miscellaneous applications of number theory