Sine-Gordon equation

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[Contributions to this section are sorely needed!]

The sine-Gordon equation

\Box u = \sin(u)

in R1 + 1 arises in the study of optical pulses, or from the Scott model of a continuum of pendula hanging from a wire. It is a completely integrable equation, and has many interesting solutions, including "breather" solutions.

Because the non-linearity is bounded, GWP is easily obtained for L2 or even L1 data.

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