41XX 


Approximations and expansions {For all approximation theory in the complex domain, see 30E05 and 30E10; for all trigonometric approximation and interpolation, see 42A10 and 42A15; for numerical approximation, see 65Dxx} 


4100 
General reference works (handbooks, dictionaries, bibliographies, etc.) 


4101 
Instructional exposition (textbooks, tutorial papers, etc.) 


4102 
Research exposition (monographs, survey articles) 


4103 
Historical (must also be assigned at least one classification number from Section 01) 


4104 
Explicit machine computation and programs (not the theory of computation or programming) 


4106 
Proceedings, conferences, collections, etc. 

41Axx 

Approximations and expansions {For all approximation theory in the complex domain, see 30E05 and 30E10; for all trigonometric approximation and interpolation, see 42A10 and 42A15; for numerical approximation, see 65Dxx} 