> 47-XX Operator theory > 47BXX Special classes of linear operators

47B06 Riesz operators; eigenvalue distributions; approximation numbers, $s$-numbers, Kolmogorov numbers, entropy numbers, etc. of operators	47B07 Operators defined by compactness properties	47B10 Operators belonging to operator ideals (nuclear, $p$-summing, in the Schatten-von Neumann classes, etc.)
47B15 Hermitian and normal operators (spectral measures, functional calculus, etc.)	47B20 Subnormal operators, hyponormal operators, etc.	47B25 Symmetric and selfadjoint operators (unbounded)
47B32 Operators in reproducing-kernel Hilbert spaces (including de Branges, de Branges-Rovnyak, and other structured spaces)	47B33 Composition operators	47B34 Kernel operators
47B35 Toeplitz operators, Hankel operators, Wiener-Hopf operators	47B36 Jacobi (tridiagonal) operators (matrices) and generalizations	47B37 Operators on special spaces (weighted shifts, operators on sequence spaces, etc.)
47B38 Operators on function spaces (general)	47B39 Difference operators	47B40 Spectral operators, decomposable operators, well-bounded operators, etc.
47B44 Accretive operators, dissipative operators, etc.	47B47 Commutators, derivations, elementary operators, etc.	47B48 Operators on Banach algebras
47B49 Transformers (= operators on spaces of operators)	47B50 Operators on spaces with an indefinite metric	47B60 Operators on ordered spaces
47B65 Positive operators and order-bounded operators	47B80 Random operators	47B99 None of the above, but in this section

47BXX Special classes of linear operators