单词：recursion formula
recursion formula的用法和样例：
例句
- There is a recursive formula for the number of spanning trees in a graph.对于一个图的生成树的棵数，存在一个递推公式。
- Some recursion formulae of Bessel functions are derived from such practice problems as well.并从该实际问题出发，推导出了一类贝塞尔函数的递推公式。
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