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中文摘要：
关于二阶椭圆边值问题，构造了一个四节点能量正交元．该单元实质上是把Carry元的形函数空间能量正交化得到的．并在各向异性网格下给出了误差估计．
英文摘要：
In this paper, a 4-parameter triangular energy-othogonal element for two order problems is presented. We prove that this element is equivalent to Carey element. The error estimate of this element on anisotroptic meshes is obtained.
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