The multiplicity of solutions and geometry in a wave equation
Q-Heung Choi Changbum Chun Tacksun Jung
We investigate multiplicity of solutions of the nonlinear one dimensional wave equation with Dirichlet boundary condition on the interval $(-\frac{\pi}{2},\frac{\pi}{2})$ and periodic condition on the variable $t.$ Our concern is to investigate a relation between multiplicity of solutions and source terms of the equation when the nonlinearity $-(bu^{+} - a u^{-})$ crosses an eigenvalue $\lambda_{10}$ and the source term $f$ is generated by three eigenfunctions.
keywords: Multiplicity of solutions Dirichlet boundary condition. eigenfunction eigenvalue

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