可惜的是，当采用一个十分庞大的附加参数组时，在某些几何条件下将导致很坏的法方程系状态，从而使测求的平差结果很差。
Unfortunately, introducing a comprehensive set of additional parameters can produce a bad condition for normal equations under certain geometry, so that the adjusted results are poorly determined.
本文导出了一维球几何定态中子输运方程菱形格式的扩散综合加速方程，并给出了差分公式。
An diffusion Synthetic acceleration equation and differencing scheme (DSA) for the diamond scheme of the one-dimensional sphere geometry steady neutron transport equation is introduced in this report.
本文讨论常微分方程差分周期解的几何性质。
In this paper the geometric properties of the difference periodic solutions of ordinary differential equations are discussed.
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