A remark on the bifurcation diagrams of superlinear elliptic equations
We prove a formula relating the index of a solution and the rotation number of a certain complex vector along bifurcation diagrams.
On the existence of a positive solution of semilinear elliptic equations in unbounded domains
On a min-max procedure for the existence of a positive solution for certain scalar field equations in R.
In this paper we mainly introduce a min-max procedure to prove the existence of positive solutions for certain semilinear elliptic equations in R.
Orbites périodiques des systèmes hamiltoniens du type de celui des trois corps
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