Fur- ther more, it is pointed out that the boundary discrete method is not only adaptable to solve the nonorthogonal boundary problems of which the variables can be separated, but also is able to deal with the nonlinear boundary value problems.

• 进一步指出，边界离散方法不仅可以解决某些可分离变量的非正交问题，而且可以解决某些非线性边 值问题。