According to the nature of two-dimensional biharmonic equations, this paper obtains a polynomial solution of the biharmonic equation for stress function by means of the MATHEMATICA software.

根据二维双调和方程的特点并借助于MATHEMATICA软件，得到了应力函数双调和方程的多项式解答。

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Like the best products, this lovely chart of the elements grew out of the passionate interest of its creator, Theodore Gray, one of the co-founders of Wolfram Research, maker of Mathematica software.

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