[理工] 离散数学

楼主: gsmzxcvbnm   2016-04-02 16:59:25
http://i.imgur.com/sS1LiUJ.jpg
例15b的R有12,21怎么还会是neither symmetric
作者: odanaga (PixiyON)   2016-04-02 17:37:00
for all都要有
楼主: gsmzxcvbnm   2016-04-02 20:03:00
没31抱歉脑残了
作者: odanaga (PixiyON)   2016-04-02 20:17:00
^^

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