Visible notes
In 1923-28 Cherry undertook research on the ordinary differential equations of dynamics and celestial mechanics following J. H. Poincaré, with H. F. Baker and J. E. Littlewood as his local guides. He looked for integrals of these equations, periodic solutions, relations between different manifolds (families) of solutions, transitions between these families (bifurcations), and the possible complexities and pathologies of non-periodic solutions. There were eleven papers in this period and two a decade later, on this still most modern of topics. From ADB entry