fixed point of mapping的用法和样例：
例句
- This paper discusses the existence of multiple positive solutions of a class of nonlinear singular boundary value problems by means of the fixed point index Theorem on cones.
摘要利用锥映射的不动点指数定理，研究了一类非线性奇异边值问题多个正解的存在性问题。 - Aim In order to develop and improve the fixed point theorem in metric space and extend the application.
摘要目的为了进一步发展和完善度量空间中的不动点理论，扩展不动点定理的应用范围。
