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2017 | OriginalPaper | Buchkapitel

On Repeated Sequential Closures of Constructible Functions in Valuations

verfasst von : Semyon Alesker

Erschienen in: Geometric Aspects of Functional Analysis

Verlag: Springer International Publishing

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Abstract

The space of constructible functions form a dense subspace of the space of generalized valuations. In this note we prove a somewhat stronger property that the sequential closure, taken sufficiently many (in fact, infinitely many) times, of the former space is equal to the latter one. This stronger property is necessary for some applications in Alesker (Geom Funct Anal 20(5):1073–1143, 2010).

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Fußnoten
1
This fact was pointed out to the author by C. Brouder in September 2013. I am very grateful to him for this remark.
 
2
This theorem says that if \(K,L \in \mathcal{K}(V )\) cannot be separated by a hyperplane (i.e. there is no hyperplane such that K and L are contained in different closed subspaces defined by the hyperplane) and if convex compact sets K i  → K and L i  → L in the Hausdorff metric as i → , then K i L i  → KL.
 
3
This canonical isomorphism was proved in Lemma 5.1.3(1) of [5]. \(C_{Z_{1}}^{\infty }(V,V al_{i}^{\infty }(V ))\) denotes the space of smooth functions on V with support in Z1 and with valued in the Fréchet space V ali (V ).
 
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2.
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Metadaten
Titel
On Repeated Sequential Closures of Constructible Functions in Valuations
verfasst von
Semyon Alesker
Copyright-Jahr
2017
DOI
https://doi.org/10.1007/978-3-319-45282-1_1