Literatur
Lazar, A. J.: Affine functions on simplexes and extreme operators. Israel J. Math.5, 31–43 (1967)
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Leha, G., Papadopoulou, S. Nachtrag zu G. Leha: Relative Korovkin-Sätze und Ränder. Math. Ann. 233, 273–274 (1978). https://doi.org/10.1007/BF01405356
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DOI: https://doi.org/10.1007/BF01405356