本文用分片线性元离散椭圆型问题。用预处理共轭梯度法求解有限元方程。

In this paper, the elliptic problems are discreted by linear elements, the finite element system are solved by PCG method.

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关于离散的拉氏函数，可以进一步的用有限元法去离散。

More, we go on discretion it by finite element method.

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关于离散的拉氏函数，可以进一步的用有限元法去离散。

More, we go on discretion it by finite element method.

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