二维Minkowski空间R~(2.1)中混合型时空曲面的等温参数

对于三维Minkowski空间中的混合型时空曲面，证明了其在类空部分和类时部分上分别存在光滑的，并且连续到交界线上的等温参数．进一步，给出了混合型时空曲面存在在其类空部分和类时部分上是光滑的，而在交界线上是连续的等温多数的一个必要条件．

The Isothermal Patameters on a Surface of Mixed Type in Minkowski 3-space

In this paper,we privee that there exist respectively the smooth isothermal parameterrs ,with can be continuous up to the borderline, on the spacelike part and the timelike part of a surface of mixed type in Minkowski 3-space. Moreover, we give a necessary condition of the existence of the isothermal parameter which is smooth on the spacelike part and the timelike part of a surface of mixed type and is continuous on the borderline.