On projections and monotony in Lp -spaces |
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Authors: | D. Landers L. Rogge |
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Affiliation: | (1) Mathematisches Institut der Universität zu Köln, Weyertal 86-90, D-5000 Köln 41;(2) Fachbereich Wirtschaftswissenschaften/Statistik, Universität Konstanz, Postfach 7733, D-7750 Konstanz |
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Abstract: | In this paper we investigate the connection between the range of nearest point projections in Lp -spaces and monotony properties of the projection operator. We show e.g. that a nearest point projection onto a closed convex subset of an Lp -space (1 ) is monotone if and only if the closed convex range is a lattice. If the range is closed linear instead of closed convex then it turns out that positivity of the projection operator implies monotony, although the projection is in general not a linear operator. We can apply these results to a lot of known cases and to a case, in which the monotony of the projection operator was unknown up to now. |
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