关于混合型方程AW_（yy）－2BW_（xy）＋CW_（xx）＋DW_y＋EW_x＋GW＝0的Tricomi问题

On Mixed Type Differential Equation AW_(xx)-2BW_(xy)+ CW_(yy)+ DW_x + EW_y + GW = 0

在椭圆域的外边界σ满足０≤θ≤２π（θ为σ的正向切线与ｘ轴的夹角）的条件下，利用相似于Ｍｏｒａｗｅｔｚ辅助函数的方法，证明广义Ｔｒｉｃｏｍｉ问题的唯一性。

When the outer boundary a of elliptic field satisfics the condition 0≤θ≤2π (Q is the angle between positive tangent and x axis), by using the method which is similar to Morawetz auxiliaryfuntion , we prove the uniqueness of generalized Tricomi problem.