Strongly Reflexive Lattices
W. E. Longstaff · Journal of the London Mathematical Society · 1975
collection of (closed linear) subspaces of H9 Alg F is used to denote the set of (bounded linear) operators on H that leave every member of F invariant. Dually, if 9t is a set of operators on H, Lat 9t is used to denote the collection of subspaces of H left invariant by every member of 91.