Articles

Copies of ℓ ₁ in positive tensor products of Orlicz sequence spaces

Published in: Quaestiones Mathematicae
Volume 34 , issue 4, pages: 407–415

DOI: 10.2989/16073606.2011.640431

Author(s): Qingying Bu*Department of Mathematics, USA, Donghai JiDepartment of Mathematics, China, Yongjin Li†Department of Mathematics, China,

Keywords: 46B42, 46B28, 46B42, 46B28,

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Abstract

Let X be a Banach lattice and ℓ _ϕ be an Orlicz sequence space associated to an Orlicz function ϕ with the Δ₂-condition. In this paper, we prove that (i) the positive injective tensor product of ℓ _ϕ and X, contains no copy of ℓ₁ if and only if both ℓ _ϕ and X contain no copy of ℓ ₁; and (ii) the positive projective tensor product of ℓ _ϕ and X, contains no copy of ℓ ₁ if and only if both ℓ _ϕ and X contain no copy of ℓ ₁ and each positive linear operator from ℓ _ϕ to X* is compact.

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