许进超
许进超-
两层网格算法的基本思想来自许进超早年关于标准有限元两层网格算法的研究工作，主要利用牛顿迭代对非线性代数系统进行线性化，并利用校正技巧进一步提高精度。
These two-grid ideas are from Xu 's work on standard finite element method . The basic idea is using Newton iteration to linearize the non-linear algebra systems , then making correction to improve the accuracy .
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其基本思想来源于许进超早年关于标准有限元两层网格算法的研究，主要是在粗网格上解原非线性离散方程，在细网格上以牛顿迭代来线性化离散方程。
The main idea derives from the early research of Xu about two-grid methods of standard finite element methods , it allows one to solve the discrete equation of original non-linear problem on coarse grid , then linearize the discrete equation with Newton iteration method on the fine grid .