Block-diagonalized rigidity matrices of symmetric frameworks and applications

Details Block-diagonalized rigidity matrices of symmetric frameworks and applications Block-diagonalized rigidity matrices of symmetric frameworks and applications

2009-06-18

arxiv.org/abs/0906.3377v1

Mathematics

Metric Geometry

48 pages, 8 figures

Scientific paper

In this paper, we give a complete self-contained proof that the rigidity matrix of a symmetric bar and joint framework (as well as its transpose) can be transformed into a block-diagonalized form using techniques from group representation theory. This theorem is basic to a number of useful and interesting results concerning the rigidity and flexibility of symmetric frameworks. As an example, we use this theorem to prove a generalization of the Fowler-Guest symmetry extension of Maxwell's rule which can be applied to both injective and non-injective realizations in all dimensions.

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