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2005 | 171 | 3 | 239-260
Tytuł artykułu

Regular vector lattices of continuous functions and Korovkin-type theorems-Part I

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We introduce and study a new class of locally convex vector lattices of continuous functions on a locally compact Hausdorff space, which we call regular vector lattices. We investigate some general properties of these spaces and of the subspaces of so-called generalized affine functions. Moreover, we present some Korovkin-type theorems for continuous positive linear operators; in particular, we study Korovkin subspaces for finitely defined operators, for the identity operator and for positive projections.
Due to its length, the paper is split up into two parts of distinct character; in this first part, we introduce the class of regular vector lattices, we prove an integral representation theorem for continuous positive linear forms and we study some enveloping functions related to a continuous positive operator, together with the corresponding space of generalized affine functions. Finally, we obtain a Stone-Weierstrass type theorem.
In the second part, which will appear in the same journal, we will present some Korovkin-type theorems, together with some applications.
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  • Department of Mathematics, University of Bari, Campus Universitario, Via E. Orabona, 4, 70125 Bari, Italy
  • Department of Mathematics, University of Bari, Campus Universitario, Via E. Orabona, 4, 70125 Bari, Italy
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bwmeta1.element.bwnjournal-article-doi-10_4064-sm171-3-3
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