Characterizes simultaneously invariant and nearly invariant subspaces for non-cyclic shift semigroups in H²(D) and related Toeplitz operators using Hitt's algorithm and Beurling-Lax theorem.
Sarason, Nearly invariant subspaces of the backward shift, Contributions to operator theory and its applications (Mesa, AZ, 1987), 481–493, Oper
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Invariance and near invariance for non-cyclic shift semigroups
Characterizes simultaneously invariant and nearly invariant subspaces for non-cyclic shift semigroups in H²(D) and related Toeplitz operators using Hitt's algorithm and Beurling-Lax theorem.