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In this paper we extend our findings in [3] and answer further questions regarding continuity and discontinuity of seminorms on infinite-dimensional vector spaces.

Functional Analysis · Mathematics 2020-03-10 Jacek Chmieliński , Moshe Goldberg

We have defined almost separable space. We show that like separability, almost separability is $c$ productive and converse also true under some restrictions. We establish a Baire Category theorem like result in Hausdorff, Pseudocompacts…

General Topology · Mathematics 2020-02-13 Sagarmoy Bag , Ram Chandra Manna , Sourav Kanti Patra

A condition for the presence of a "gap" between symmetric spaces sufficient for the inclusion of one of these spaces into the other to be disjointly strictly singular is found. This condition is stated in terms of fundamental functions of…

Functional Analysis · Mathematics 2007-05-23 S. V. Astashkin

Characterizations of the associated spaces and second associated spaces of the Hardy space on $\mathbb{R}^n$ are given. Some results on the associated spaces of the $\textrm{BMO}(\mathbb{R}^n)$ space are proved also.

Functional Analysis · Mathematics 2023-10-31 Dmitrii V. Prokhorov

We investigate several boundedness properties of function spaces considered as uniform spaces.

General Topology · Mathematics 2018-02-19 Lubica Hola , Ljubisa D. R. Kocinac

We study different types of spacetime singularities which emerge in the context of disformal electrodynamics. The latter is characterized by transformations of the background metric which preserve regular (non-null) solutions of Maxwell…

General Relativity and Quantum Cosmology · Physics 2026-02-25 Eduardo Bittencourt , Ricardo Fernandes , Érico Goulart , José Eloy Ottoni

We classify the space-like biharmonic surfaces in 3-dimension pseudo-Riemannian space form, and construct explicit examples of proper biharmonic hypersurfaces in general ADS space.

Differential Geometry · Mathematics 2008-08-12 Wei Zhang

We give a geometric characterization of extremal sets in ell_p spaces that generalizes our previous result for such sets in Hilbert spaces.

Metric Geometry · Mathematics 2007-05-23 V. NguyenKhac , K. NguyenVan

We characterize certain weighted Hardy spaces on the unit disk and completely describe their dual spaces.

Complex Variables · Mathematics 2015-08-31 Nihat Gökhan Göğüş

We present equivalent conditions for a space $X$ with an unconditional basis to admit an equivalent norm with a strictly convex dual norm.

Functional Analysis · Mathematics 2022-06-14 R. J. Smith , S. Troyanski

We give solutions to some extremal problems involving distance function in mixed norm spaces of harmonic functions on the unit ball of R^n

Complex Variables · Mathematics 2012-01-18 Milos Arsenovic , Romi Shamoyan

In this paper, we deal with uniform spaces whose diagonal uniformity admits a basis consisting of equivalence relations. Such non-Archimedean uniform spaces are particularly interesting for applications in commutative ring theory, because…

General Topology · Mathematics 2021-11-19 Daniel Windisch

We exhibit isomorphisms of Grassmann spaces and their relationship with collineations and embeddings of the underlying projective spaces.

Algebraic Geometry · Mathematics 2024-03-19 Hans Havlicek

We give a geometric characterization of self-extremal sets in $L_p(\Om)$ spaces that partially extends our previous results to the case of $L_p$\ spaces.

Metric Geometry · Mathematics 2007-05-23 V. Nguyen-Khac , K. Nguyen-Van

Some sharp discrete inequalities in normed linear spaces are obtained. New reverses of the generalised triangle inequality are also given.

Functional Analysis · Mathematics 2007-05-23 Sever Silvestru Dragomir

Necessary and sufficient conditions for a separable Banach space to be a dual space are proved. Some applications are discussed

Functional Analysis · Mathematics 2010-03-12 Stefano Rossi

We present some new examples of separable (\mathcal_\infty) spaces which are (\ell_r) saturated for some (1 < r < \infty).

Functional Analysis · Mathematics 2010-03-03 I. Gasparis , M. K. Papadiamantis , D. Z. Zisimopoulou

We characterize AE(0)-spaces that are Baire isomorphic to the powers of the real line.

General Topology · Mathematics 2007-05-23 Alex Chigogidze

We characterize the orderings of pairs of sets induced by several distances: Hamming, Jaccard, S\o rensen-Dice and Overlap. We also characterize these distances.

Discrete Mathematics · Computer Science 2025-07-09 Thierry Marchant , Sandip Sarkar

We introduce an alternative description of coarse proximities. We define a coarse normality condition for connected coarse spaces and show that this definition agrees with large scale normality defined in [3] and asymptotic normality…

General Topology · Mathematics 2019-03-04 Pawel Grzegrzolka , Jeremy Siegert