This, paper gives some approximative solving methods of radiative transfer equation in astrophysics. It is found that mathematical approximations of ten are complete and accurate in physics.
本文给出了天体物理学中辐射转移方程的几种近似解法，讨论了数学近似和物理条件如何吻合，发现：数学上的近似常常不影响物理上完整和自洽。
Many mathematical models in physics, mechanics, biology and astronomy are given in such forms. Many problems of dynamical systems can be reduced to an iterative functional equation.
许多物理学、力学、生物学以及天文学问题的数学模型都是由连续的或离散的迭代过程描述的。
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