角形域上波动方程边值问题（Ⅰ）

Boundary value problems of the wave equation in angular domain (Ⅰ)

用几何方法给出了在角形域内波动方程Ｕｔｔ＝ｃ２Ｕｘｘ第一边值问题解的表达式。该方法直观、简捷、明了。

The geometric method is used to give expression about the solution of the wave equation U tt = c 2U xx with first boundary value problems in angular domain. This method is direct,simple and clear.