Results 41 to 50 of about 1,200,505 (78)

Compact convex sets free of inner points in infinite‐dimensional topological vector spaces

open access: yesMathematische Nachrichten, Volume 297, Issue 5, Page 1668-1677, May 2024.
Abstract An inner point of a non‐singleton convex set M$M$ is a point x∈M$x\in M$ satisfying that for all m∈M∖{x}$m\in M\setminus \lbrace x\rbrace$ there exists n∈M∖{m,x}$n\in M\setminus \lbrace m,x\rbrace$ such that x∈(m,n)$x\in (m,n)$. We prove the existence of convex compact subsets free of inner points in the infinite‐dimensional setting. Following
Almudena Campos‐Jiménez   +1 more
wiley   +1 more source

Delta‐points and their implications for the geometry of Banach spaces

open access: yesJournal of the London Mathematical Society, Volume 109, Issue 5, May 2024.
Abstract We show that the Lipschitz‐free space with the Radon–Nikodým property and a Daugavet point recently constructed by Veeorg is in fact a dual space isomorphic to ℓ1$\ell _1$. Furthermore, we answer an open problem from the literature by showing that there exists a superreflexive space, in the form of a renorming of ℓ2$\ell _2$, with a Δ$\Delta ...
Trond A. Abrahamsen   +6 more
wiley   +1 more source

Sesquilinear quantum stochastic analysis in Banach space [PDF]

open access: yes, 2014
A theory of quantum stochastic processes in Banach space is initiated. The processes considered here consist of Banach space valued sesquilinear maps.
Lindsay, Martin   +2 more
core   +3 more sources

Covering Convex Bodies and the Closest Vector Problem. [PDF]

open access: yesDiscrete Comput Geom, 2022
Naszódi M, Venzin M.
europepmc   +1 more source

Geometry of Banach spaces with property β

open access: yes, 1999
The authors wish to thank S. Troyanski for valuable discussions. Also, they are very grateful to the referee for many helpful suggestions and, in particular, for observing the validity of Proposition 3.2.We prove that every Banach space can be ...
Moreno, José Pedro   +2 more
core   +1 more source

Unit balls of Polyhedral Banach spaces with many extreme points

open access: yes, 2023
Let $E$ be a $(\mathrm{IV})$-polyhedral Banach space. We show that, for each $\epsilon>0$, $E$ admits an $\epsilon$-equivalent $\mathrm{(V)}$-polyhedral norm such that the corresponding closed unit ball is the closed convex hull of its extreme points ...
De Bernardi, Carlo Alberto
core  

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