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<p style="line-height: 200%" align="center"><b><font size="5">闭包的求法</font></b> </p>
<p style="line-height: 200%"><b>1.集合求法</b> </p>
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<p style="line-height: 200%"> r(R)=R<img border="0" src="Image/bing.gif" width="14" height="14">R<sup>0</sup>=R<img border="0" src="Image/bing.gif" width="14" height="14">I<sub>A</sub></li>
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<p style="line-height: 200%">s(R)=R<img border="0" src="Image/bing.gif" width="14" height="14">R<sup>-1</sup></li>
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<p style="line-height: 200%">t(R)=R<img border="0" src="Image/bing.gif" width="14" height="14">R<sup>2</sup><img border="0" src="Image/bing.gif" width="14" height="14">R<sup>3</sup><img border="0" src="Image/bing.gif" width="14" height="14">……
（证明）<br>
=R<img border="0" src="Image/bing.gif" width="14" height="14">R<sup>2</sup><img border="0" src="Image/bing.gif" width="14" height="14">R<sup>3</sup><img border="0" src="Image/bing.gif" width="14" height="14">……<img border="0" src="Image/bing.gif" width="14" height="14">R<sup>n</sup></li>
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<p style="line-height: 200%"><b>2.关系矩阵法</b></p>
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<p style="line-height: 200%">Mr=M<sub>R</sub>+E<sub>A</sub></p>
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<p style="line-height: 200%">Ms=M<sub>R</sub>+M<sub>R-1</sub>=M<sub>R</sub>+(M<sub>R</sub>)<sub>T</sub></p>
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<p style="line-height: 200%">Mt=M<sub>R</sub>+M<sub>R</sub><sup>2</sup>+……</p>
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<p style="line-height: 200%"><b>3.关系图法</b></p>
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<p style="line-height: 200%">r(R):在每个结点上加上回路</p>
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<p style="line-height: 200%">s(R):对原有的弧添加对称弧</p>
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<p style="line-height: 200%">t(R):.....</p>
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<p style="line-height: 200%"> </p>
<p style="line-height: 200%">作业: 给出下列关系的r(R),s(R),t(R)的关系图</p>
<p style="line-height: 200%" align="center"><img border="0" src="Image/gxt12.gif" width="303" height="70"></p>
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<p style="line-height: 200%"> <img src="IMAGE/yuancheng_2.gif" width="100" height="69"></div>
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<p style="line-height: 200%" align="center"> </p>
<p style="line-height: 150%"> </p><p align="right"><b><a href="contentFrame-mulu.htm"><<back</a></b>
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