The isomorphism problem of planar polygon spaces
Geometric Topology
2014-02-26 v1 Algebraic Topology
Abstract
We give a proof of a Conjecture of Walker which states that one can recover the lengths of the bars of a circular linkage from the cohomology ring of the configuration space. For a large class of length vectors, this has been shown by Farber, Hausmann and Schuetz. In the remaining cases, we use Morse theory and the fundamental group to describe a subring of the cohomology invariant under graded ring isomorphism. From this subring the conjecture can be derived by applying a result of Gubeladze on the isomorphism problem of monoidal rings.
Cite
@article{arxiv.0906.4499,
title = {The isomorphism problem of planar polygon spaces},
author = {Dirk Schuetz},
journal= {arXiv preprint arXiv:0906.4499},
year = {2014}
}
Comments
32 pages, 2 figures