Closed ideals of operators on the Baernstein and Schreier spaces

Abstract

We study the lattice of closed ideals of bounded operators on two families of Banach spaces: the Baernstein spaces $B_p$ for $1<p<\infty$ and the Schreier spaces $S_p$ for $1\le p<\infty$. Our main conclusion is that there are $2^{\mathfrak{c}}$ many closed ideals that lie between the ideals of compact and strictly singular operators on each of these spaces, and also $2^{\mathfrak{c}}$ many closed ideals that contain projections of infinite rank. Counterparts of results of Gasparis and Leung using a numerical index to distinguish the isomorphism types of subspaces spanned by subsequences of the unit vector basis for the higher-order Schreier spaces play a key role in the proofs, as does the Johnson-Schechtman technique for constructing $2^{\mathfrak{c}}$ many closed ideals of operators on a Banach space.

Theorems & Definitions (77)

• Theorem 1.1
• Lemma 2.1
• proof
• Lemma 2.2
• proof
• Definition 2.3
• Theorem 2.4
• Definition 2.5
• Lemma 2.6
• proof