本文通过讨论广义重积分与广义逐次积分之间的关系，得出一些结论，并将相应结果推广到广义三重积分与广义三次积分中。
In this paper, some relationships between improper double integral and improper iterated are discussed, and the corresponding results are generalized into the improper triple integrals.
采用改进型逐次逼近解法(MSAM)计算了积分方程，该方法所需内存量小，且可适用于高电导率对比度地层。
The integral equations were computed by modified successive approximation method (MSAM). The method needs less computer memory requirements and is suitable for high-conductivity-contrast formation.
在一元数值积分公式的基础上，提出了二重数值积分的复合公式，并给出复化复合公式和逐次减半的复合递推公式，通过实验比较了两种算法。
The article gives the reversible condition of a kind of jump Vandermonde matrix through linear equations, and recursion formula and the expression of its inverse Matrix.
在一元数值积分公式的基础上，提出了二重数值积分的复合公式，并给出复化复合公式和逐次减半的复合递推公式，通过实验比较了两种算法。
The article gives the reversible condition of a kind of jump Vandermonde matrix through linear equations, and recursion formula and the expression of its inverse Matrix.
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