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Generation of Uniformly Closed Algebras of Functions
Authors:M?Isabel?Garridomontalvo@unexes" title="igarrido@unexes  Email author" target="_blank">montalvo@unexes" itemprop="email" data-track="click" data-track-action="Email author" data-track-label="">Email author  Francisco?Montalvo
Institution:(1) Dpto. de Matemáticas, Universidad de Extremadura, 06071 Badajoz, Spain
Abstract:For a linear sublattice Fscr of C(X), the set of all real continuous functions on the completely regular space X, we denote by A(Fscr) the smallest uniformly closed and inverse-closed subalgebra of C(X) that contains Fscr. In this paper we study different methods to generate A(Fscr) from Fscr. For that, we introduce some families of functions which are defined in terms of suprema or sums of certain countably many functions in Fscr. And we prove that A(Fscr) is the uniform closure of each of these families. We obtain, in particular, a generalization of a known result about the generation of A(Fscr) when Fscr is a uniformly closed linear sublattice of bounded functions.
Keywords:continuous functions  lattices  algebras  inverse-closed  uniformly closed  2-finite covers
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