PERIODIC SOLUTIONS OF A NONLINEAR NON-DISSIPATIVE WAVE EQUATION.
NEW YORK UNIV N Y COURANT INST OF MATHEMATICAL SCIENCES
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This paper concerns an existence proof of solutions of the partial differential equation. The main difficulty is solving an associated infinite dimensional bifurcation equation. It is also shown how to find a solution by an expansion method if F is real analytic in u and a convergence proof for the formal series constructed is supplied. Author