Nonlinear wave equations and constrained harmonic motion.
The study of the Korteweg-deVries, nonlinear Schrödinger, Sine-Gordon, and Toda lattice equations is simply the study of constrained oscillators. This is likely to be true for any nonlinear wave equation associated with a second-order linear problem.
Courant Institute of Mathematical Sciences, New York University, New York 10012.
P
P
Deift
F
F
Lund
E
E
Trubowitz