Operators on Banach Spaces Taking Compact Sets Inside Ranges of Vector Measures

1992 ◽  
Vol 116 (4) ◽  
pp. 1031
Author(s):  
Candido Pineiro
Keyword(s):  
Banach Spaces ◽  
Compact Sets ◽  
Vector Measures

scholarly journals On p-compact sets in classical Banach spaces

2014 ◽  
Vol 9 ◽  
pp. 51-63
Author(s):  
Juan Manuel Delgado ◽  
Candido Pineiro
Keyword(s):  
Banach Spaces ◽  
Compact Sets

Banach Spaces that are Uniformly Rotund in Weakly Compact Sets of Directions

1977 ◽  
Vol 29 (5) ◽  
pp. 963-970 ◽  
Author(s):  
Mark A. Smith
Keyword(s):  
Banach Space ◽  
Unit Ball ◽  
Banach Spaces ◽  
Nonzero Element ◽  
Bounded Subset ◽  
Compact Sets ◽  
Weakly Compact ◽  
Uniform Rotundity ◽  
Minimum Depth ◽  
Weakly Compact Sets

In a Banach space, the directional modulus of rotundity, δ (ϵ, z), measures the minimum depth at which the midpoints of all chords of the unit ball which are parallel to z and of length at least ϵ are buried beneath the surface. A Banach space is uniformly rotund in every direction (URED) if δ (ϵ, z) is positive for every positive ϵ and every nonzero element z. This concept of directionalized uniform rotundity was introduced by Garkavi [6] to characterize those Banach spaces in which every bounded subset has at most one Čebyšev center.

scholarly journals Isometries of spaces of unbounded continuous functions

2001 ◽  
Vol 63 (3) ◽  
pp. 475-484
Author(s):  
Jesús Araujo ◽  
Krzysztof Jarosz
Keyword(s):  
Banach Spaces ◽  
Metric Spaces ◽  
Continuous Functions ◽  
Topological Spaces ◽  
Compact Sets ◽  
Surjective Isometry ◽  
Bounded Continuous Functions ◽  
Stone Theorem

By the classical Banach-Stone Theorem any surjective isometry between Banach spaces of bounded continuous functions defined on compact sets is given by a homeomorphism of the domains. We prove that the same description applies to isometries of metric spaces of unbounded continuous functions defined on non compact topological spaces.

scholarly journals Weakly compact sets and smooth norms in Banach spaces

2002 ◽  
Vol 65 (2) ◽  
pp. 223-230 ◽  
Author(s):  
Marián Fabian ◽  
Vicente Montesinos ◽  
Václav Zizler
Keyword(s):  
Banach Spaces ◽  
Lower Semicontinuous ◽  
Compact Sets ◽  
Weakly Compact ◽  
Weakly Compact Sets

Two smoothness characterisations of weakly compact sets in Banach spaces are given. One that involves pointwise lower semicontinuous norms and one that involves projectional resolutions of identity.

scholarly journals Remarks on the semivariation of vector measures with respect to Banach spaces.

2007 ◽  
Vol 75 (3) ◽  
pp. 469-480 ◽  
Author(s):  
Oscar Blasco
Keyword(s):  
Banach Spaces ◽  
Vector Measures ◽  
Tensor Norm

Suppose that and . It is shown that any Lp(µ)-valued measure has finite L2(v)-semivariation with respect to the tensor norm for 1 ≤ p < ∞ and finite Lq(v)-semivariation with respect to the tensor norm whenever either q = 2 and 1 ≤ p ≤ 2 or q > max{p, 2}. However there exist measures with infinite Lq-semivariation with respect to the tensor norm for any 1 ≤ q < 2. It is also shown that the measure m (A) = χA has infinite Lq-semivariation with respect to the tensor norm if q < p.

Vector Integration and Stochastic Integration in Banach Spaces

2018 ◽  
Author(s):  
Nicolae Dinculeanu
Keyword(s):  
Banach Spaces ◽  
Positive Measure ◽  
Integration Theory ◽  
Stochastic Integration ◽  
Bochner Integral ◽  
Finite Variation ◽  
Vector Measures ◽  
Vector Integration ◽  
Step Functions ◽  
Integrable Variation

This article deals with vector integration and stochastic integration in Banach spaces. In particular, it considers the theory of integration with respect to vector measures with finite semivariation and its applications. This theory reduces to integration with respect to vector measures with finite variation which, in turn, reduces to the Bochner integral with respect to a positive measure. The article describes the four stages in the development of integration theory. It first provides an overview of the relevant notation for Banach spaces, measurable functions, the integral of step functions, and measurability with respect to a positive measure before discussing the Bochner integral. It then examines integration with respect to measures with finite variation, semivariation of vector measures, integration with respect to a measure with finite semivariation, and stochastic integrals. It also reviews processes with integrable variation or integrable semivariation and concludes with an analysis of martingales.

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