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Call a binary relation R on a set S complete if and only if
[xRy or yRx] for all distinct x,y ¡Ê S.  

acyclicµÄ¹ØÏµÓе㸴ÔÓ  

Call a binary relation R on a set S cyclic if and only if there
exists a finite sequence of distinct elements x1,x2,...,xk ¡Ê S
such that k > 1 and xjRxj+1 for all j ¡Ê {1,2,...,k-1} and xkRx1.

Call a binary relation R on a set S acyclic if and only if it is not cyclic.

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4Â¥: Originally posted by ŬÁ¦·¹ at 2012-05-03 15:29:25:
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