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文中采用了几种预条件技术来降低算子方程的条件数。
Several preconditioning techniques have been used to reduce the condition number of the operator equations.
把不完全乔里斯基预条件技术应用到其积分方程，极大地改善了其谱特性，加速了矩阵方程的迭代收敛。
The IC precondition technique is applied to the integral equation to improve the spectral properties and accelerate the iteration speed of matrix equation.
本文还研究了几种预条件技术，用于改善算子的条件数，进一步加速迭代，同时用数值结果对比了各自的优劣。
Some preconditioner technique is also studied to improve the condition number and further accelerate iterations, comparisons are made between them by numerical results.
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