
Abstract In this short note, we prove that for a dense set A ⊂ X ( X is a Banach space) there is a non-trivial closed subspace M ⊂ X such that A ∩ M is dense in M . We use this result to answer a question posed in Madore and Martinez-Avendano (2011) [9] . In particular, we show that every hypercyclic operator is subspace-hypercyclic.
Hypercyclicity, Subspace-hypercyclicity
Hypercyclicity, Subspace-hypercyclicity
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