【多选题】【消耗次数:1】
设 A={0,1}, ○为函数的复合运算,代数áAA, ○?是:
是代数;
是半群;
是独异点;
是群。
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相关题目
【简答题】 什么样的代数系统是半群?
【简答题】 什么样的代数系统是独异点?
【单选题】 设 {0,1}集合A上的布尔加+与布尔乘*,则代数是:
①  是含幺环不是整环;
②  是交换环不是整环;
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【单选题】 设 复数集合C上的加法运算+,则代数是:
①  是代数不是半群;
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④  是群。
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①  不是代数系统;
②  半群;
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