40XX 


Sequences, series, summability 


4000 
General reference works (handbooks, dictionaries, bibliographies, etc.) 


4001 
Instructional exposition (textbooks, tutorial papers, etc.) 


4002 
Research exposition (monographs, survey articles) 


4003 
Historical (must also be assigned at least one classification number from Section 01) 


4004 
Explicit machine computation and programs (not the theory of computation or programming) 


4006 
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] 