R S MacKay et al 1989 Nonlinearity 2 555 doi:10.1088/0951-7715/2/4/004
R S MacKay, J D Meiss and J Stark
Show affiliationsThe authors derive a criterion for the non-existence of invariant Lagrangian graphs for symplectic twist maps of an arbitrary number of degrees of freedom, interpret it geometrically, and apply it to a four-dimensional example.
37J45 Periodic, homoclinic and heteroclinic orbits; variational methods, degree-theoretic methods
37J40 Perturbations, normal forms, small divisors, KAM theory, Arnol'd diffusion
Issue 4 (November 1989)
R S MacKay et al 1989 Nonlinearity 2 555
M Holland et al 1996 Quantum Semiclass. Opt. 8 571
T Dray 1990 Class. Quantum Grav. 7 L131
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