47Dxx Algebraic systems of linear operators

47D03  (Semi)groups of linear operators, {For nonlinear operators,
               See 47H20; See also 20M20}
47D06  One-parameter semigroups and linear evolution equations
47D07  Markov semigroups, {For Markov processes, See 60Jxx}
47D09  Operator cosine functions and higher-order Cauchy problems
47D15  Linear spaces of operators, See also {46A32, 46B28}
47D20  Convex sets and cones of operators, See also {90C25, 90C31}
47D25  Operator algebras on Hilbert space
47D27  Dual operator algebras
47D30  Operator algebras on Banach spaces and other linear
               topological spaces
47D35  Dual spaces of operator algebras and topological groups
47D40  Algebras of unbounded operators
47D45  Applications of operator algebras to physics, See Also {
               46L60, 46N50, 46N55, 47N50, 47N55}
47D50  Operator ideals
47D99  None of the above but in this section