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Finite direct sums of cyclic embeddingsMay 14 2019In this paper we generalize Kaplansky's combinatorial characterization of the isomorphism types of embeddings of a cyclic subgroup in a finite abelian group given in his 1951 book ``Infinite Abelian Groups''. For this we introduce partial maps on Littlewood-Richardson ... More Tchebycheff systems and extremal problems for generalized moments: a brief surveyJul 18 2011A brief presentation of basics of the theory of Tchebycheff and Markov systems of functions and its applications to extremal problems for integrals of such functions is given. The results, as well as all the necessary definitions, are stated in most common ... More math.OCmath.PRmath.STstat.THPrimary 26D15, 49K30, 49K27, 52A40, secondary 49K35, 52A20, 52A41,
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