Orbits of the Backward Shifts with limit points

Abstract

We show that the bilateral backward shift on ${\ell }^p(\mathbb{Z},\omega )$ that has a projective orbit with a non-zero limit point is supercyclic. This phenomenon holds also for $\Gamma$-supercyclicity, which extends a result obtained for the first time by Chan and Seceleanu. Moreover, we show that if $K$ is a compact subset of ${\ell }^p(\mathbb{N},\omega )$ such that its orbit under the unilateral backward shift $B$ on ${\ell }^p(\mathbb{N},\omega )$ has a non-zero weak limit point, then $B$ is hypercyclic.