On the Moduli Space of Multipolygonal Linkages in the Plane

Details On the Moduli Space of Multipolygonal Linkages in the Plane On the Moduli Space of Multipolygonal Linkages in the Plane

2003-06-30

arxiv.org/abs/math/0307001v1

Mathematics

Geometric Topology

29 pages, 12 figures

Scientific paper

The geometric, topological, and symplectic properties of moduli spaces (spaces of configurations modulo rotations and translations) of polygonal linkages have been studied by Kapovich, Millson, and Kamiyama, et. al. One can form a polygonal linkage by taking two free linkages and identifying initial and terminal vertices. This can be generalized so that one takes three free linkages and identifies initial and terminal vertices. Then one obtains a linkage which contains multiple polygons, any two of which have shared edges. The geometric and topological properties of moduli spaces of these multipolygonal linkages are studied. These spaces turn out to be compact algebraic varieties. Some conditions under which these spaces are smooth manifolds, cross products or disjoint unions of moduli spaces of polygonal linkages, or connected, are determined. In addition, dimensions in the smooth manifold cases and some Euler characteristics are computed.

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