The Conley conjecture for Hamiltonian systems on the cotangent bundle and its analogue for Lagrangian systems

Morse theory for periodic solutions of hamiltonian systems and the maslov index

Dietmar Salamon, Eduard Zehnder · Communications on Pure and Applied Mathematics · 1992 · 498 citations

Natural Sciences, Mathematics, Differential Equations +16

Morse‐type index theory for flows and periodic solutions for Hamiltonian Equations

Charles C. Conley, Eduard Zehnder · Communications on Pure and Applied Mathematics · 1984 · 466 citations

Natural Sciences, Mathematics, Differential Equations +13

On differentiable functions with isolated critical points

Detlef Gromoll, Wolfgang Meyer · Topology · 1969 · 277 citations

Natural Sciences, Emergency Medical Services, Differential Equations +8

On the maslov index

Sylvain E. Cappell, Ronnie Lee, Edward Y. Miller · Communications on Pure and Applied Mathematics · 1994 · 276 citations

Natural Sciences, Mathematics, Physics +15

On the Morse index in variational calculus

J. J. Duistermaat · Advances in Mathematics · 1976 · 265 citations

Natural Sciences, Mathematics, Differential Equations +11