35XX 


Partial differential equations 

35Pxx 

Spectral theory and eigenvalue problems for partial differential operators [See also 47Axx, 47Bxx, 47F05] 


35P05 
General spectral theory of PDE 


35P10 
Completeness of eigenfunctions, eigenfunction expansions for PDO 


35P15 
Estimation of eigenvalues, upper and lower bounds 


35P20 
Asymptotic distribution of eigenvalues and eigenfunctions for PDO 


35P25 
Scattering theory for PDE [See also 47A40] 


35P30 
Nonlinear eigenvalue problems, nonlinear spectral theory for PDO 


35P99 
None of the above, but in this section 