Mathematical proof of the method is given.
给出了该法的数学证明。
The method of Constructing Function is often used and difficult to master in Mathematical proof.
利用它来构造函数解决问题，往往能达到事半功倍的效果。
The method of Constructing Function is often used and difficult to master in Mathematical proof.
利用它来构造函数解决问题，往往能达到事半功倍的效果。
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