40G99 None of the above, but in this section

40Hxx Functional analytic methods in summability

40H05 Functional analytic methods in summability

40H99 None of the above, but in this section

40Jxx Summability in abstract structures [See also <a href="#code:43A55">43A55</a>, <a href="#code:46A35">46A35</a>, <a href="#code:46B15">46B15</a>]

40J05 Summability in abstract structures [See also <a href="#code:43A55">43A55</a>, <a href="#code:46A35">46A35</a>, <a href="#code:46B15">46B15</a>] (should also be assigned at least one other classification number in this section)

40J99 None of the above, but in this section

41-XX Approximations and expansions {For all approximation theory in the complex domain, see <a href="#code:30E05">30E05</a> and <a href="#code:30E10">30E10</a>; for all trigonometric approximation and interpolation, see <a href="#code:42A10">42A10</a> and <a href="#code:42A15">42A15</a>; for numerical approximation, see <a href="#code:65Dxx">65Dxx</a>}

41-00 General reference works (handbooks, dictionaries, bibliographies, etc.)

41-01 Instructional exposition (textbooks, tutorial papers, etc.)

41-02 Research exposition (monographs, survey articles)

41-03 Historical (must also be assigned at least one classification number from Section 01)

41-04 Explicit machine computation and programs (not the theory of computation or programming)

41-06 Proceedings, conferences, collections, etc.

41Axx Approximations and expansions {For all approximation theory in the complex domain, see <a href="#code:30E05">30E05</a> and <a href="#code:30E10">30E10</a>; for all trigonometric approximation and interpolation, see <a href="#code:42A10">42A10</a> and <a href="#code:42A15">42A15</a>; for numerical approximation, see <a href="#code:65Dxx">65Dxx</a>}

41A05 Interpolation [See also <a href="#code:42A15">42A15</a> and <a href="#code:65D05">65D05</a>]

41A10 Approximation by polynomials {For approximation by trigonometric polynomials, see <a href="#code:42A10">42A10</a>}

41A17 Inequalities in approximation (Bernstein, Jackson, Nikol'skiĭ-type inequalities)