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We prove that there is a compact space $L$ and a 1-complemented subspace of the Banach space $C(L)$ which is not isomorphic to a space of continuous functions.

Functional Analysis · Mathematics 2023-05-09 Grzegorz Plebanek , Alberto Salguero Alarcón

This paper is about certain linear subspaces of Banach SN spaces (that is to say Banach spaces which have a symmetric nonexpansive linear map into their dual spaces). We apply our results to monotone linear subspaces of the product of a…

Functional Analysis · Mathematics 2013-06-26 Stephen Simons

For a large class of Banach spaces, a general construction of subspaces without local unconditional structure is presented. As an application it is shown that every Banach space of finite cotype contains either $l_2$ or a subspace without…

Functional Analysis · Mathematics 2016-09-06 R. Komowski , Nicole Tomczak-Jaegermann

We show that there exist $\mathcal L_\infty$-subspaces of separable isomorphically polyhedral Lindenstrauss spaces that cannot be renormed to be a Lindenstrauss space.

Functional Analysis · Mathematics 2016-01-12 Jesús M. F. Castillo , Pier Luigi Papini

In this paper Hilbert spaces are characterized among Banach spaces in terms of transitivity with respect to nicely behaved subgroups of the isometry group. For example, the following result is typical here: If X is a real Banach space…

Functional Analysis · Mathematics 2008-09-11 Jarno Talponen

This paper studies Newtonian Sobolev-Lorentz spaces. We prove that these spaces are Banach. We also study the global p,q-capacity and the p,q-modulus of families of rectifiable curves. Under some additional assumptions (that is, the space…

Metric Geometry · Mathematics 2012-03-06 Serban Costea , Michele Miranda

We study some structural aspects of the subspaces of the non-commutative (Haagerup) L_p-spaces associated with a general (non necessarily semi-finite) von Neumann algebra A. If a subspace X of L_p(A) contains uniformly the spaces \ell_p^n,…

Functional Analysis · Mathematics 2019-12-10 Yves Raynaud , Quanhua Xu

We study Banach spaces X with a strongly asymptotic l_p basis (any disjointly supported finite set of vectors far enough out with respect to the basis behaves like l_p) which are minimal (X embeds into every infinite dimensional subspace).…

Functional Analysis · Mathematics 2007-05-23 S. J. Dilworth , V. Ferenczi , Denka Kutzarova , E. Odell

In a previous paper, we introduced L^p UHF algebras for p in [1, \infty). We concentrated on the spatial L^p UHF algebras, which are classified up to isometric isomorphism by p and the scaled ordered K_0-group. In this paper, we concentrate…

Functional Analysis · Mathematics 2013-09-26 N. Christopher Phillips

The following theorem is the main result of this note. Theorem 1. Let $(E, \|\cdot\|_E) $ be a rearrangement invariant Banach function space on the interval $[0, 1]$. If $E$ is isometric to $\L_p [0, 1]$ for some $1\le p<\infty$, then $E$…

Functional Analysis · Mathematics 2009-09-25 Yuri A. Abramovich , Mikhail Zaidenberg

We address the existence of non-trivial closed invariant subspaces of operators $T$ on Banach spaces whenever their square $T^2$ have or, more generally, whether there exists a polynomial $p$ with $\mbox{deg}(p)\geq 2$ such that the lattice…

Functional Analysis · Mathematics 2024-09-04 Maximiliano Contino , Eva Gallardo-Gutierrez

We prove that if a non-atomic separable Banach lattice in a weak Hilbert space, then it is lattice isomorphic to $L_2(0,1)$.

Functional Analysis · Mathematics 2008-02-03 Niels Jorgen Nielsen

Let \(X\) be a compact metric space and \(E\) be a Banach space. \(\lip (X, E)\) denotes the Banach space of all \(E\)-valued little Lipschitz functions on \(X\). We show that \(\lip (X, E)^{**}\) is isometrically isomorphic to Banach space…

Functional Analysis · Mathematics 2020-09-22 Shinnosuke Izumi

We prove that the spaces $\ell_p$, $1<p<\infty, p\ne 2$, and all infinite-dimensional subspaces of their quotient spaces do not admit equivalent almost transitive renormings. This is a step towards the solution of the Banach-Mazur rotation…

Functional Analysis · Mathematics 2015-01-28 S. J. Dilworth , B. Randrianantoanina

For a locally compact group $G$ and $p \in (1,\infty)$, we define $B_p(G)$ to be the space of all coefficient functions of isometric representations of $G$ on quotients of subspaces of $L_p$ spaces. For $p =2$, this is the usual…

Functional Analysis · Mathematics 2007-05-23 Volker Runde

We show that the dual of every infinite-dimensional Lipschitz-free Banach space contains an isometric copy of $\ell_\infty$ and that it is often the case that a Lipschitz-free Banach space contains a $1$-complemented subspace isometric to…

Functional Analysis · Mathematics 2017-12-05 Marek Cúth , Michal Johanis

In this note we give a simple proof that every subspace of L_p, 2<p<infinity, with an unconditional basis has an equivalent norm determined by partitions and weights. Consequently L_p has a norm determined by partitions and weights.

Functional Analysis · Mathematics 2007-05-23 Dale Alspach , Simei Tong

A Banach space X is said to have the Tsirelson property if it does not contain subspaces that are isomorphic to l_{p}, p in [1,infty) or c_{0}. The article contains a quite simple method to producing Banach spaces with the Tsirelson…

Functional Analysis · Mathematics 2007-05-23 Eugene Tokarev

Following results of Bourgain and Gorelik we show that the spaces $\ell_p$, $1<p<\infty$, as well as some related spaces have the following uniqueness property: If $X$ is a Banach space uniformly homeomorphic to one of these spaces then it…

Functional Analysis · Mathematics 2009-09-25 William B. Johnson , Joram Lindenstrauss , Gideon Schechtman

We show that the space $\text{Lip}_0(\mathbb R^n)$ is the dual space of $L^{1}({\mathbb R}^{n}; {\mathbb R}^{n})/N$ where $N$ is the subspace of $L^{1}({\mathbb R}^{n}; {\mathbb R}^{n})$ consisting of vector fields whose divergence…

Functional Analysis · Mathematics 2017-02-21 Gilles Godefroy , Nicolas Lerner