third integral

The third type im-proper integral can be written as the algebraic sum of the first and second type integrals.

第三类广义积分都可以写成第一类与第二类广义积分的代数和。

Construction theorems of second and third order ordinary differential equations which admit higher order integrals are formulated by use of the method of determining higher order integral factors and higher order integrals for ordinary differential equations, and by use of the characteristic set method as well.

本文利用确定高次积分因子的引理与确定对应的高次积分的公式以及微分特征列集（吴）方法，给出了拥有高次积分的二阶三阶常微分方程结构定理。

Theoretically, the presented method can be widely used in solving the first, second and third order Fredholm integral equation in a better precision.

改进的点配法能以较高的精度求解第一、第二、第三类Fredholm积分方程。修正中波天线模型，按照模型可以精确求解天线输入阻抗。

Cauchy integral on third classical domain

第三类典型域上的Cauchy型积分

Third, the integral and systematic cognition of nature.

第三，自然界的整体性和系统性的认知。