
An operator T T acting on a Hilbert space H H is hypercyclic if, for some vector x x in H H , the orbit { T n x : n ≥ 0 } \{ {T^n}x:n \geq 0\} is dense in H H . We show the existence of a hypercyclic operator—in fact, a bilateral weighted shift—whose adjoint is also hypercyclic. This answers positively a question of D. A. Herrero.
hypercylic operator, bilateral shift, Special classes of linear operators, Linear operators on special spaces (weighted shifts, operators on sequence spaces, etc.)
hypercylic operator, bilateral shift, Special classes of linear operators, Linear operators on special spaces (weighted shifts, operators on sequence spaces, etc.)
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