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- 杨帆和原晋江还在文[17]中证明了2n个顶点的无爪图如果局部2-连通,则一定是导出匹配可扩的。Cameron gave the concept of induced matching in [2]. Some fundamental results on induced matching can be found in [2,4,5].
- 听到杨帆事件,我很震惊。震惊的不是学生的大胆,而是教授的粗鲁与无知。一个堂堂大学教授,为了阻止学生逃课,竟然要采用锁门这样恶心的法西斯手段!What shocked me was the discourteousness and ignorance of the professor. A high-profile professor had to lock the door, by such a fascistic method, to resist truancy.