It can get an output from an input without knowing the mathematic relation of input and output.

给定一个输入，即可得到一个输出，而不需要知道输入和输出之间存在着怎样的数学关系。

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On this basis, it emphasized how to establish the node basic information database and the restricting relation database, and constructed out the mathematic model of the planar linkage mechanism.

在此基础上，着重阐述了如何建立结点基本信息数据库和约束关系数据库，从而构造出平面连杆机构的数学模型。

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As a mathematic branch studying the graphical composite relation and fabric, the graph theory can be expediently used in solving graphical problems with computer algorithm.

图论是研究图的组合关系及结构的一个数学分支，可以方便地实现图形同计算机算法的结合。

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