[代數] 么半群中有元素存在兩個左反元素
舉個例子
(S,*) : well-defined,closed, 有結合律,
且 for all a in S, exist identity e, s.t a*e = a = e*a
但是 exist a in S, s.t a have two left-inverses
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02/24 22:37, , 1F
02/24 22:37, 1F
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02/24 22:40, , 2F
02/24 22:40, 2F
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02/26 01:00, , 3F
02/26 01:00, 3F