On stretching the interval simplex-permutohedron

Details On stretching the interval simplex-permutohedron On stretching the interval simplex-permutohedron

2011-06-16

arxiv.org/abs/1106.3250v6

Mathematics

Combinatorics

32 pages, corrected version

Scientific paper

A family of polytopes introduced by E.M. Feichtner, A. Postnikov and B. Sturmfels, which were named nestohedra, consists in each dimension of an interval of polytopes starting with a simplex and ending with a permutohedron. This paper investigates a problem of changing and extending the boundaries of these intervals. An iterative application of Feichtner-Kozlov procedure of forming complexes of nested sets is a solution of this problem. By using a simple algebraic presentation of members of nested sets it is possible to avoid the problem of increasing the complexity of the structure of nested curly braces in elements of the produced simplicial complexes.

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