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。
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。
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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