S. Argyros

activity

19922026

most citedComplexity of weakly null sequences

158 citations · 248 across the 39 of their papers we have counts for

collaborators

43 papers

math.FA2026

Explicity Defined Norms on $J T_{*}$ Spaces

Spiros A. Argyros, Pavlos Motakis

We present a Banach space $X_{α}$ , equipped with an explicit norm, whose properties resemble those of the predual $J T_{*}$ of the James Tree space. In particular, $X_{α}$ admits a shrink…

math.FA2026

Embedding $ℓ_{2}$ and $J$ into subspaces of $J T$ and $J T^{*}$

Spiros A. Argyros, Manuel Gonzalez, Pavlos Motakis

In the first part of the paper we show that every closed subspace of $J T$ or $J T^{*}$ contains $ℓ_{2}$ complemented in $J T$ or $J T^{*}$ respectively, and $J T$ contains uncomplemented…

math.FA2026

A Study of the Extreme Points in the Unit Ball of $J T$

Spiros A. Argyros

In this note, we investigate the extreme points of the unit ball of the James Tree space ( $J T$ ). We relate the geometric structure of $J T$ to the classical James space $J$ and prov…

math.FA2024

The HI extension of the standard HI spaces

Spiros A. Argyros, Antonis Manoussakis, Pavlos Motakis

A Hereditarily Indecomposable (HI) Banach space $X$ admits an HI extension if there exists an HI space $Z$ such that $X$ is isomorphic to a subspace $Y$ of $Z$ and $Z / Y$ is of infi…

math.FA2024

The Extreme Points of the Unit Ball of the James space $J$ and its dual spaces

Spiros A. Argyros, Manuel González

We provide a new proof of S. Bellenot's characterization of the extreme points of the unit ball $B_{J}$ of James quasi-reflexive space $J$ . We also provide an explicit description of…

math.FA2021

The complete separation of the two finer asymptotic $ℓ_{p}$ structures for $1 \leq p < \infty$

Spiros A. Argyros, Alexandros Georgiou, Antonis Manoussakis +1

For $1 \leq p < \infty$ , we present a reflexive Banach space $X_{awi}^{(p)}$ , with an unconditional basis, that admits $ℓ_{p}$ as a unique asymptotic model and does…

Explicity Defined Norms on JT∗​ Spaces

Embedding ℓ2​ and J into subspaces of JT and JT∗

A Study of the Extreme Points in the Unit Ball of JT

The HI extension of the standard HI spaces

The Extreme Points of the Unit Ball of the James space J and its dual spaces

The complete separation of the two finer asymptotic ℓp​ structures for 1≤p<∞

Explicity Defined Norms on $J T_{*}$ Spaces

Embedding $ℓ_{2}$ and $J$ into subspaces of $J T$ and $J T^{*}$

A Study of the Extreme Points in the Unit Ball of $J T$

The Extreme Points of the Unit Ball of the James space $J$ and its dual spaces

The complete separation of the two finer asymptotic $ℓ_{p}$ structures for $1 \leq p < \infty$