positive solutive的用法和樣例：
例句
- The uniqueness of the positive solution to the problem under certain conditions is also proved.The nonexistence of the positive solution is discussed.
同時，證明了一定條件下正解的惟一性，最後討論了正解的不存在性。 - 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.
摘要利用錐映射的不動點指數定理，研究了一類非線性奇異邊值問題多個正解的存在性問題。
