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1·It is widely used to develop complex functions into Laurent series at the neighborhood of a pole.

在数学中经常要用到复变函数在极点邻域内展开的罗朗级数。

2·It is assumed that the plate is in close contact with the ring without initial stresses. Stress functions of the plate and the ring are formed by a complex Laurent series.

假设板与环间处于无初应力的紧密接触状态，弹性板和弹性环的应力函数都可按复劳伦级数展开。

3·The complex potentials were expanded into Laurent Series whose coefficients could be expressed by recurrent relations. The stresses and displacements were then be determined by complex potentials.

将复势函数进行罗伦级数展开，通过边界条件得到罗伦级数展开式系数的递推公式，并由复势函数确定应力分量和位移分量。

4·This paper points out the relationship between the coefficient of Laurent series and that of the sum of partial fractions for rational functions. Some typical examples are presented in illustration.

笔者在此指出了罗朗级数的系数与有理函数分解的部分分式之和的系数之间的关系，并举出应用实例。