This article makes an extension on the problem of integralfactor in the total differential equation and has drawn two theorems.
本文就恰当微分方程的积分因子问题进行推广，得出两个定理。
2
The stable solutions of the integral equation are obtained by the extrapolation method when the smooth factor equals to zero.
然后利用外插值的方法，外推得到光滑因子为零时的积分方程的稳定解。
3
To resolve the problem in the application of the models, the author expanded the classical factor set of models by introducing the concept of integral regression.