This is an announcement for the paper “On the non-embedding of $\ell_1$ in the James Tree Space” by Ioakeim Ampatzoglouhttps://arxiv.org/search/math?searchtype=author&query=Ampatzoglou%2C+I.

Abstract: James Tree Space ($\mathcal{JT}$), introduced by R. James, is the first Banach space constructed having non-separable conjugate and not containing $\ell^1$. James actually proved that every infinite dimensional subspace of $\mathcal{JT}$ contains a Hilbert space, which implies the $\ell^1$ non-embedding. In this expository article, we present a direct proof of the $\ell^1$ non-embedding, using Rosenthal's $\ell^1$- Theorem and some measure theoretic arguments, namely Riesz's Representation Theorem.

The paper may be downloaded from the archive by web browser from URL https://arxiv.org/abs/1812.07825