求解下列混合问题:\left\{\begin{array}{ll} u_{t}=a^{2} u_{x x}-b^{2} u, & 00, \\ u(0, t)=u(l, t)=0, & t \geq 0 \\ u(x, 0)=\varphi(x), & 0 \leq x \leq l . \end{array}\right.
发布时间:2024-06-02 15:51:10