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.
Hayashi, The kernel of a Toeplitz operator, Integral Equations and Operator Theory, 9(4)(1986), 588–591
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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.