42XX 


Harmonic analysis on Euclidean spaces 

42Cxx 

Nontrigonometric harmonic analysis 


42C05 
Orthogonal functions and polynomials, general theory [See also 33C45, 33C50, 33D45] 


42C10 
Fourier series in special orthogonal functions (Legendre polynomials, Walsh functions, etc.) 


42C15 
General harmonic expansions, frames 


42C20 
Other transformations of harmonic type 


42C25 
Uniqueness and localization for orthogonal series 


42C30 
Completeness of sets of functions 


42C40 
Wavelets and other special systems 


42C99 
None of the above, but in this section 