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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. ²Î¿¼ÎÄÕµĵØÖ·£º http://alumnus.caltech.edu/~sepp ... ary%20Relations.htm |

3Â¥2012-05-03 15:27:00

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