Abstract
In the vein of Rado's beautiful characterization of matroids by the functioning of the Greedy Algorithm we prove that our persistent frustrations in obtaining analogues and generalizations of Shapiro's Lemma had a good reason.
Essentially, only the classical case of the power set can work.
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References
Kolchin, E.R.,Differential algebra and algebraic groups. Academic Press, New York, 1973, p. 53.
Welsh, D.J.A.,Matroid theory. Academic Press, New York, 1976, pp. 357 and 52.
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Vijayan, K.S. A characterization of the simplex. Aeq. Math. 24, 33–38 (1982). https://doi.org/10.1007/BF02193032
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DOI: https://doi.org/10.1007/BF02193032