Quasi-linear equation are those that have coefficients that depend on the unknown function. This is the case of the Gordon's sine equation: U_{xx}-U_{tt}=sin(U).

This equation arises in condensed material phenomenon. Some of the solutions of this equation are **solitons**, that are waves that propagate without dissipation and after collide with others, they don't destroy nor deform.

The next applet shows the solution of this equation.

Last modified 2/1/2000 by Juan de Lara ( Juan.Lara@ii.uam.es, http://www.ii.uam.es/~jlara) need help for using this courses?.