Using analyzing Legendre polynomial to solve the equation of the pair-distribution function, some order functions and the corresponding order results are obtained through matching inner and outer fields.

• 以勒让德多项式分解来处理对分布函数 ；进一步求得不同级的函数方程 ；再以内外域解的匹配来求得逐级方程具体形式和逐级解 .