\alpha-Projectable and laterally \alpha-complete Archimedean lattice-ordered groups with weak unit via topology

سال انتشار: 1403
نوع سند: مقاله ژورنالی
زبان: انگلیسی
مشاهده: 21

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شناسه ملی سند علمی:

JR_CGASAT-20-1_003

تاریخ نمایه سازی: 14 بهمن 1402

چکیده مقاله:

Let \bf{W} be the category of Archimedean lattice-ordered groups with weak order unit, \bf{Comp} the category of compact Hausdorff spaces, and \mathbf{W} \xrightarrow{Y} \mathbf{Comp} the Yosida functor, which represents a \bf{W}-object A as consisting of extended real-valued functions A \leq D(YA) and uniquely for various features. This yields topological mirrors for various algebraic (\bf{W}-theoretic) properties providing close analysis of the latter. We apply this to the subclasses of \alpha-projectable, and laterally \alpha-complete objects, denoted P(\alpha) and L(\alpha), where \alpha is a regular infinite cardinal or \infty. Each \bf{W}-object A has unique minimum essential extensions A \leq p(\alpha) A \leq l(\alpha) A in the classes P(\alpha) and L(\alpha), respectively, and the spaces Yp(\alpha) A and Yl(\alpha) A are recognizable (for the most part); then we write down what p(\alpha) A and l(\alpha) A are as functions on these spaces. The operators p(\alpha) and l(\alpha) are compared: we show that both preserve closure under all implicit functorial operations which are finitary. The cases of A = C(X) receive special attention. In particular, if (\omega < \alpha) l(\alpha) C(X) = C(Yl(\alpha) C(X)), then X is finite. But (\omega \leq \alpha) for infinite X, p(\alpha) C(X) sometimes is, and sometimes is not, C(Yp(\alpha) C(X)).

نویسندگان

Brian Wynne

Department of Mathematics, Lehman College, City University of New York, Bronx, USA

Anthony Hager

Department of Mathematics and CS, Wesleyan University, Middletown, CT ۰۶۴۵۹.

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