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AC后的疑惑

Posted by fjnu_jxd_008 at 2005-08-03 19:03:26 on Problem 2526 
如果s在S中，那么根据for every point p in S there exists a point q in S such that p-s = s-q.
s该对应什么点，同时p-s中的-是什么意思
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