Norm-Closed Intervals of Norm-Complete Ordered Abelian Groups

Norm-Closed Intervals of Norm-Complete Ordered Abelian Groups Let (G,u) be an Archimedean norm-complete dimension group with order-unit. Continuing a previous paper, we study intervals (i.e., nonempty upward directed lower subsets) of G which are closed with respect to the canonical norm of (G,u). In particular, we establish a canonical one-to-one correspondence between closed intervals of G and certain affine lower semicontinuous functions on the state space of (G,u), which allows us to solve several problems of K. R. Goodearl about inserting affine continuous functions between convex upper semicontinuous and concave lower semicontinuous functions. This yields in turn new results about analogues of multiplier groups for norm-closed intervals. Positivity Springer Journals

Norm-Closed Intervals of Norm-Complete Ordered Abelian Groups

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Kluwer Academic Publishers
Copyright © 1997 by Kluwer Academic Publishers
Mathematics; Fourier Analysis; Operator Theory; Potential Theory; Calculus of Variations and Optimal Control; Optimization; Econometrics
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