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The length of vectors in representation spaces. (English) Zbl 0407.22012
Algebraic geometry, Proc. Summer Meet., Copenh. 1978, Lect. Notes Math. 732, 233-243 (1979).

22E45 Representations of Lie and linear algebraic groups over real fields: analytic methods
14L24 Geometric invariant theory
20G20 Linear algebraic groups over the reals, the complexes, the quaternions