Abstract

It is well known that if T is a hypercyclic operator, thenp(T � ) = �. We prove in this paper that this is not true for subspace-hypercyclic oper- ators. We show that if T is subspace-hypercyclic, thenp(T � ) may be empty or not. Moreover we show that for every scalarwith |�| > 1, there exists a subspace-hypercyclic operator T such that ||T|| = |�| andp(T � ) 6 �.

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