45K99 None of the above, but in this section

45Lxx Theoretical approximation of solutions {For numerical analysis, see <a href="#code:65Rxx">65Rxx</a>}

45L05 Theoretical approximation of solutions {For numerical analysis, see <a href="#code:65Rxx">65Rxx</a>}

45L99 None of the above, but in this section

45M99 None of the above, but in this section

45Nxx Abstract integral equations, integral equations in abstract spaces

45N05 Abstract integral equations, integral equations in abstract spaces

45N99 None of the above, but in this section

45Pxx Integral operators [See also <a href="#code:47B38">47B38</a>, <a href="#code:47G10">47G10</a>]

45P05 Integral operators [See also <a href="#code:47B38">47B38</a>, <a href="#code:47G10">47G10</a>]

45P99 None of the above, but in this section

45Q99 None of the above, but in this section

45Rxx Random integral equations [See also <a href="#code:60H20">60H20</a>]

45R05 Random integral equations [See also <a href="#code:60H20">60H20</a>]

45R99 None of the above, but in this section

46-XX Functional analysis {For manifolds modeled on topological linear spaces, see <a href="#code:57Nxx">57Nxx</a>, <a href="#code:58Bxx">58Bxx</a>}

46-00 General reference works (handbooks, dictionaries, bibliographies, etc.)

46-01 Instructional exposition (textbooks, tutorial papers, etc.)

46-02 Research exposition (monographs, survey articles)

46-03 Historical (must also be assigned at least one classification number from Section 01)

46-04 Explicit machine computation and programs (not the theory of computation or programming)

46-06 Proceedings, conferences, collections, etc.

46Axx Topological linear spaces and related structures {For function spaces, see <a href="#code:46Exx">46Exx</a>}

46A03 General theory of locally convex spaces

46A04 Locally convex Fréchet spaces and (DF)-spaces

46A08 Barrelled spaces, bornological spaces

46A11 Spaces determined by compactness or summability properties (nuclear spaces, Schwartz spaces, Montel spaces, etc.)

46A13 Spaces defined by inductive or projective limits (LB, LF, etc.) [See also <a href="#code:46M40">46M40</a>]