Abstract
This chapter is a unified treatment, based on projected Gram matrices (PGMs), of the problems of local, dimensional, and universal rigidities of bar frameworks. This PGM-based approach makes these problems amenable to semidefinite programming methodology; and naturally gives rise to results expressed in terms of Gale matrices. We survey known results emphasizing numerical examples and proofs which highlight the salient aspects of this approach.
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Notes
- 1.
The rank function is lower semi-continuous on the set of matrices of order n − 1.
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Acknowledgements
Research supported by the Natural Sciences and Engineering Research Council of Canada.The author would like to thank an anonymous referee for his/her remarks which improved the presentation of this chapter.
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Alfakih, A.Y. (2014). Local, Dimensional and Universal Rigidities: A Unified Gram Matrix Approach. In: Connelly, R., Ivić Weiss, A., Whiteley, W. (eds) Rigidity and Symmetry. Fields Institute Communications, vol 70. Springer, New York, NY. https://doi.org/10.1007/978-1-4939-0781-6_3
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