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The nonsolvability by radicals of generic 3-connected planar Laman graphs.

Research output: Contribution to journalJournal article


Journal publication date2007
JournalTransactions of the American Mathematical Society
Number of pages35
Original languageEnglish


We show that planar embeddable -connected Laman graphs are generically non-soluble. A Laman graph represents a configuration of points on the Euclidean plane with just enough distance specifications between them to ensure rigidity. Formally, a Laman graph is a maximally independent graph, that is, one that satisfies the vertex-edge count together with a corresponding inequality for each subgraph. The following main theorem of the paper resolves a conjecture of Owen (1991) in the planar case. Let be a maximally independent -connected planar graph, with more than 3 vertices, together with a realisable assignment of generic distances for the edges which includes a normalised unit length (base) edge. Then, for any solution configuration for these distances on a plane, with the base edge vertices placed at rational points, not all coordinates of the vertices lie in a radical extension of the distance field.

Bibliographic note

Copyright 2006, American Mathematical Society RAE_import_type : Journal article RAE_uoa_type : Pure Mathematics