scientific article; zbMATH DE number 5585080

zbMath1174.34400MaRDI QIDQ5322728

Sheng Ma, Qin Jiang

Publication date: 22 July 2009

Title: zbMATH Open Web Interface contents unavailable due to conflicting licenses.

zbMATH Keywords

Hamiltonian systemssaddle point theoremsubharmonic solutions

Mathematics Subject Classification ID

Periodic solutions to ordinary differential equations (34C25) Variational principles in infinite-dimensional spaces (58E30)