Table of Contents: “.... Invariant theory and reduction -- 6. Exercises -- II. Geodesics on S3 -- 1. The geodesic and Delaunay vector fields -- 2.The SO(4) momentum mapping -- 3. The Kepler problem -- 3.1 The Kepler vector field -- 3.2 The so(4) momentum map -- 3.3 Kepler's equation -- 4...”

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