The Giesy--James theorem for general index $p$, with an application to operator ideals on the $p$th James space

Abstract

A theorem of Giesy and James states that $c_0$ is finitely representable in James' quasi-reflexive Banach space $J_2$. We extend this theorem to the $p$th quasi-reflexive James space $J_p$ for each $p\in (1,\infty )$. As an application, we obtain a new closed ideal of operators on $J_p$, namely the closure of the set of operators that factor through the complemented subspace $({\ell }_{\infty }^1\oplus {\ell }_{\infty }^2\oplus ...\oplus {\ell }_{\infty }^n\oplus ...{)}_{{\ell }_p}$ of $J_p$.

16 pages