Generators, Relations and Symmetries in Pairs of 3x3 Unimodular Matrices

Details Generators, Relations and Symmetries in Pairs of 3x3 Unimodular Matrices Generators, Relations and Symmetries in Pairs of 3x3 Unimodular Matrices

2006-01-06

arxiv.org/abs/math/0601132v4

J. Algebra 313 (2007), no. 2, 782--801

Mathematics

Algebraic Geometry

21 pages. This fourth version is the author's final version which includes new comments and some corrections

Scientific paper

10.1016/j.jalgebra.2007.01.003

Denote the free group on two letters by F2 and the SL(3,C)-representation variety of F2 by R = Hom(F2, SL(3,C)). There is a SL(3,C)-action on the coordinate ring of R, and the geometric points of the subring of invariants is an affine variety X. We determine explicit minimal generators and defining relations for the subring of invariants and show X is a degree 6 hyper-surface in C9 mapping onto C8. Our choice of generators exhibit Out(F2) symmetries which allow for a succinct expression of the defining relations.

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