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</script>The purpose of this paper is to discuss the relationship between commutative and non-commutative integrability of Hamiltonian systems and to construct new examples of integrable geodesic flows on Riemannian manifolds. In particular, we prove that the geodesic flow of the bi-invariant metric on any bi-quotient of a compact Lie group is integrable in non-commutative sense by means of polynomial integrals, and therefore, in classical commutative sense by means of $C^\infty$--smooth integrals.
19 pages, minor changes, to appear in Annals of Global Analysis and Geometry
Geodesic flows in symplectic geometry and contact geometry, Completely integrable finite-dimensional Hamiltonian systems, integration methods, integrability tests, noncommutative integrability, FOS: Physical sciences, geodesic flows, Mathematical Physics (math-ph), Completely integrable systems and methods of integration for problems in Hamiltonian and Lagrangian mechanics, 37J35, 37J15, 70H06, 70H33, 53D20, 53D25, integrable Hamiltonian systems, Momentum maps; symplectic reduction, Symmetries, invariants, invariant manifolds, momentum maps, reduction, Mathematical Physics
Geodesic flows in symplectic geometry and contact geometry, Completely integrable finite-dimensional Hamiltonian systems, integration methods, integrability tests, noncommutative integrability, FOS: Physical sciences, geodesic flows, Mathematical Physics (math-ph), Completely integrable systems and methods of integration for problems in Hamiltonian and Lagrangian mechanics, 37J35, 37J15, 70H06, 70H33, 53D20, 53D25, integrable Hamiltonian systems, Momentum maps; symplectic reduction, Symmetries, invariants, invariant manifolds, momentum maps, reduction, Mathematical Physics
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