Monodromy Groups in the Study of Abstract Polytopes (Seminar DM)

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Monodromy Groups in the Study of Abstract Polytopes

Gordon Williams

Torek, 13. oktobra 2015, od 10h do 12h, Plemljev seminar, Jadranska 19


The objective of this talk is to provide an introduction to several open problems about the monodromy groups of abstract polytopes.

Abstract polytopes are a generalization of convex polytopes to purely combinatorial objects, as partially ordered sets satisfying some relatively straightforward constraints. The most symmetric type of abstract polytopes, the regular abstract polytopes, have been studied extensively, and their analysis has been greatly facilitated by the study of their automorphism groups. However, non-regular abstract polytopes are poorly understood, in part because their automorphism group doesn't give enough information about their structure. To begin to investigate non-regular polytopes, we have used two main tools: representation of non-regular polytopes as quotients of regular polytopes, and analysis of the "monodromy group" of the polytope, which encodes combinatorially the connective structure of the polytope. There are important relationships between these two representations, and understanding the relationship motivates many interesting problems in the theory of non-regular abstract polytopes.

This talk will assume no background understanding of either abstract polytopes or monodromy groups. I will provide basic definitions and examples to illustrate both important basic facts about what we have learned about quotient representations and monodromy groups, as well as facilitate introducing open problems in the area.

Glej tudi/See also

Seminar za diskretno matematiko

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