Chapter 1: Foundations -- 1.0 Review of Differential Calculus and Topology -- 1.1 Differentiable Manifolds -- 1.2 Tensor Bundles -- 1.3 Immersions and Submersions -- 1.4 Vector Fields and Tensor Fields -- 1.5 Covariant Derivation -- 1.6 The Exponential Mapping -- 1.7 Lie Groups -- 1.8 Riemannian Manifolds -- 1.9 Geodesics and Convex Neighborhoods -- 1.10 Isometric Immersions -- 1.11 Riemannian Curvature -- 1.12 Jacobi Fields -- Chapter 2: Curvature and Topology -- 2.1 Completeness and Cut Locus -- 2.1 Appendix - Orientation -- 2.2 Symmetric Spaces -- 2.3 The Hilbert Manifold of H1-curves -- 2.4 The Loop Space and the Space of Closed Curves -- 2.5 The Second Order Neighborhood of a Critical Point -- 2.5 Appendix - The S1- and the Z2-action on AM -- 2.6 Index and Curvature -- 2.6 Appendix - The Injectivity Radius for 1/4-pinched Manifolds -- 2.7 Comparison Theorems for Triangles -- 2.8 The Sphere Theorem -- 2.9 Non-compact Manifolds of Positive Curvature -- Chapter 3: Structure of the Geodesic Flow -- 3.1 Hamiltonian Systems -- 3.2 Properties of the Geodesic Flow -- 3.3 Stable and Unstable Motions -- 3.4 Geodesics on Surfaces -- 3.5 Geodesics on the Ellipsoid -- 3.6 Closed Geodesies on Spheres -- 3.7 The Theorem of the Three Closed Geodesics -- 3.8 Manifolds of Non-Positive Curvature -- 3.9 The Geodesic Flow on Manifolds of Negative Curvature -- 3.10 The Main Theorem for Surfaces of Genus 0 -- References -- Index.