This work characterizes nearly invariant subspaces with finite defect for the backward shift on the real Hardy space, yielding a characterization of almost invariant subspaces.
Sarason,Nearly invariant subspaces of the backward shift, Oper
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Nearly invariant subspaces in the real Hardy space
This work characterizes nearly invariant subspaces with finite defect for the backward shift on the real Hardy space, yielding a characterization of almost invariant subspaces.