The Uniqueness of the Solution for a Class of the Two-Order Linear Elliptical Equations with Constant Coefficient

This paper gives a condition that the symmetry part of three two order matrixes can be changed into positive matrixes under the same three kinds of transformation,there for,it is proved that a class of the two order linear elliptical equations with constant coefficient can be changed into strongly elliptical equations.By use of this result,the uniqueness of the solution about the Dirichlet problem in bounded closed domain for this kind of equations is confirmed.