panda
Variational methods
Hamiltonian systems
Differential equations, nonlinear
Nonlinear Differential equations
Systems Theory
Calculus of variations
Differential equations, partial
Global analysis (Mathematics)
Mathematical optimization
Mathematics
Hilbert's talk at the second International Congress of 1900 in Paris marked the beginning of a new era in the calculus of variations. A development began which, within a few decades, brought tremendous success, highlighted by the 1929 theorem of Ljusternik and Schnirelman on the existence of three d…
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