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- W4300534324 abstract "This paper introduces an inductively defined tree notation for all the faces of polytopes arising from a simplex by truncations. This notation allows us to view inclusion of faces as the process of contracting tree edges. Our notation instantiates to the well-known notations for the faces of associahedra and permutohedra. Various authors have independently introduced combinatorial tools for describing such polytopes. We build on the particular approach developed by Dosen and Petric, who used the formalism of hypergraphs to describe the interval of polytopes from the simplex to the permutohedron. This interval was further stretched by Petric to allow truncations of faces that are themselves obtained by truncations, and iteratively so. Our notation applies to all these polytopes. We illustrate this by showing that it instantiates to a notation for the faces of the permutohedron-based associahedra, that consists of parenthesised words with holes. Dosen and Petric have exhibited some families of hypergraph polytopes (associahedra, permutohedra, and hemiassociahedra) describing the coherences, and the coherences between coherences etc., arising by weakening sequential and parallel associativity of operadic composition. We complement their work with a criterion allowing us to recover the information whether edges of these operadic polytopes come from sequential, or from parallel associativity. We also give alternative proofs for some of the original results of Dosen and Petric." @default.
- W4300534324 created "2022-10-03" @default.
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- W4300534324 date "2017-01-01" @default.
- W4300534324 modified "2023-10-17" @default.
- W4300534324 title "Syntactic aspects of hypergraph polytopes" @default.
- W4300534324 hasPublicationYear "2017" @default.
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