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By João B. (Ed.) Prolla

ISBN-10: 0444852646

ISBN-13: 9780444852649

ISBN-10: 0720419646

ISBN-13: 9780720419641

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Extra info for Approximation Theory and Functional Analysis, Proceedings of the International Symposium on Approximation Theory

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L lemma: we have [ f (x) I f (x) I . l E Mx(X). t: boundaJty ization of Korovkin spaces. It uses the notion of the 0XX x E of X X with respect to permitting only X which by definition is the setof points Ex as a representing measure: {x E X The. n 6unct-<-oYl. 6pace. opace -<-6 and only THEOREM 2: '<'6 0xx = x. It is this result which allows in many concrete examples a quick proof of a Korovkin-type theorem. In particular, Korovkin'sclassical result follows almost immediately. It states that, for a compact interval X = [a,b] on the real line functions 1, id, id 2 (id = identity lR, map the linear hull of the three x ~ x) is a Korovkin space.

Equals X We have seen that in the relative theory one cannot expect a similar result out an additional assumption on £. (X) of (in the sense of Choquet). £ leads to the complete generalization of Theorem 1. ai if the state space S (£) is a simplex. ve. ne: Kor The proof given in Lazar [6] [8] (:IC, £) = "'£ 3C • makes use of the selection theorem of for (metrizable) simplexes. e -i6 and only -i6 For the remaining part of the proof we only have that il£ to observe {f'" = f} obtain a is contained in the intersection of all the sets X with arbitrary i£ = £.

21 H. BAUER, Silovscher Rand und Dirichletsches Problem, Ann. Inst. Fourier 11 (1961), 89 - 136. [3] H. BAUER, Approximation and abstract boundaries, Amer. Math. Monthly (to appear). [ 4) H. BAUER and K. ath. Ann. [5] G. -6, vol. II w. [6] (to appear). A. Benjamin, Inc. Y), (1969). A. LAZAR, Spaces of affine continuous functions on simplexes, Trans. Amer. Math. Soc. 134 (1968), 503 - 525. [71 G. LEHA, Relative Korovkin-Satze und Rander, Math. Ann. 229 (1977), 87 - 95. [8] G. LEHA and S. PAPADOPOULOU, Nachtrag zu "G.

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Approximation Theory and Functional Analysis, Proceedings of the International Symposium on Approximation Theory by João B. (Ed.) Prolla


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