引入差分方程研究布朗运动，会发现极限情况下的布朗运动所遵循的偏微分方程就是数学物理方程中的扩散方程。
Studying Brownian motion by the difference equation, We can find that the partial differential equation describing the Brownian particle motion is a diffusion equation in mathematical physics.
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.
采用斜向差分算子，建立斜向隐式差分格式，再结合边界条件，对扩散方程进行求解。
Based on the skew direction difference operator, the implicit skew difference schemes were constructed, and the boundary condition was unified, to solve the diffusion equation.
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