[理工] 離散 GROUP
http://imgur.com/a/bh71e
想問圖
(G,*)是一個group
可是 a^3
如果 (a*a)*a = b*a = e
a*(a*a) = a*b = c
不是應該要有associative 兩者應該相等嗎?
還是我哪裡沒考慮到?
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