[理工] 離散 代數結構
想問上圖中characteristic 的意思是什麼
跟它的一些特性
2.
http://imgur.com/bVPbLGk
想問上圖劃黃線處 k為zero element
為什麼可以 得出 k⊙k = k (打不出圈圈裡面是叉叉的符號)
希望大家能幫我解答一下
謝謝
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