Smooth Solution of the Dirichlet Problem for a Quasilinear Hyperbolic Equation of the Second Order

Abstract

On the basis of the exact solution of the linear Dirichlet problem $u_{tt} - u_{xx} = f\left( {x,t} \right)$ , $u\left( {0,t} \right) = u\left( {\pi ,t} \right) = 0,{\text{ }}u\left( {x,0} \right) = u\left( {x,2\pi } \right) = 0,$ $0 \leqslant x \leqslant \pi ,{\text{ }}0 \leqslant t \leqslant 2\pi ,$ we obtain conditions for the solvability of the corresponding Dirichlet problem for the quasilinear equation u _tt − u _xx = f(x, t, u, u _t).