### 40-XX Sequences, series, summability

- 40-00 General reference works (handbooks, dictionaries, bibliographies, etc.)
- 40-01 Instructional exposition (textbooks, tutorial papers, etc.)
- 40-02 Research exposition (monographs, survey articles)
- 40-03 Historical (must be assigned at least one classification number from 01-XX)
- 40-04 Explicit machine computation and programs (not the theory of computation or programming)
- 40-06 Proceedings, conferences, collections, etc.
- 40Axx Convergence and divergence of infinite limiting processes
- 40B05 Multiple sequences and series {(should also be assigned at least one other classification number in this section)}
- 40Cxx General summability methods
- 40Dxx Direct theorems on summability
- 40Exx Inversion theorems
- 40F05 Absolute and strong summability
- 40Gxx Special methods of summability
- 40H05 Functional analytic methods in summability
- 40J05 Summability in abstract structures, See also {43A55, 46A35,
46B15}

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