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[讨论] 6.3.35 的解答有误

楼主: Favonia (00010110110001101010100)   2006-04-09 17:13:19
就举三角形好了
如果做 contraction 会有平行边
再做一次 contraction 会有 loop
原证明两者都没有考虑 |||
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