阶乘和拉格朗日反演公式的渐近展开
The asymptotic expansion for the factorial and Lagrange inversion formula
摘要：
利用一个初等函数的幂的导数，得到了自然数阶乘的渐近展开的系数的一个显式的简单公式。唯一的明确表达的系数，似乎是已知的是，在书中的L。孔泰，这是在第一种相关联的斯特林数的总和。通过考虑相关的第二类斯特林数的二元生成函数，根据我们的分析，还可以得出关于它们的系数的另一个表达式。比较与孔泰的表达产生的组合身份之间的第一和第二类相关的斯特林数。它通过类比提出了另一个可能的系数公式，用一个涉及对数的函数表示，事实上证明是正确的。由此产生的系数，以及第一个确定通过拉格朗日反演公式作为一对正式的系列，这使我们能够获得一些递归的逆的奇数系数。
英文摘要：
We obtain an explicit simple formula for the coefficients of the asymptotic expansion for the factorial of a natural number,in terms of derivatives of powers of an elementary function. The unique explicit expression for the coefficients that appears to be known is that in the book by L. Comtet, which is given in terms of sums of associated Stirling numbers of the first kind. By considering the bivariate generating function of the associated Stirling numbers of the second kind, another expression for the coefficients in terms of them follows also from our analysis. Comparison with Comtet's expression yields combinatorial identities between associated Stirling numbers of first and second kind. It suggests by analogy another possible formula for the coefficients, in terms of a function involving the logarithm, that in fact proves to be true. The resulting coefficients, as well as the first ones are identified via the Lagrange inversion formula as the odd coefficients of the inverse of a pair of formal series, which permits us to obtain also some recurrences.
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