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- W2765783560 abstract "The associahedron is at the interface between several mathematical fields. Combinatorially, it is the simplicial complex of dissections of a convex polygon (sets of mutually noncrossing diagonals). Geometrically, it is a polytope whose vertices and edges encode the dual graph of the complex of dissections. Finally the associahedron describes the combinatorial structure defining a presentation by generators and relations of certain algebras, called ``cluster algebras''. Because of its ubiquity, we regularly come up with new families generalizing this object. However there often are only few interactions between them. From our perspective, there are two main issues when studying them: looking for relations on the basis of known properties of the associahedron; and, for each, looking for combinatorial, geometric and algebraic frameworks in the same spirit.In this thesis, we deal with the link between combinatorics and geometry for some of these generalizations: graph associahedra, subword complexes and accordion complexes. We follow a guidelight consisting in adapting, to these three families, a method for constructing associahedra as fans (sets of polyhedral cones), called the d-vector method and coming from cluster algebra theory. More generally, our main concern is to realize, that is geometrically embed in a vector space, abstract complexes. We obtain three new families of generalizations, and a fourth conjectural one whose first instances already constitute significant advances.Finally in addition to the geometric results, we prove combinatorial properties specific to each encountered simplicial complex." @default.
- W2765783560 created "2017-11-10" @default.
- W2765783560 creator A5039311819 @default.
- W2765783560 date "2017-07-06" @default.
- W2765783560 modified "2023-09-23" @default.
- W2765783560 title "Geometrical and combinatorial generalizations of the associahedron" @default.
- W2765783560 hasPublicationYear "2017" @default.
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