japan01
回答: 配有乘法的集合叫群,乘法到底是怎样做的。把元素和乘法具体化,抽象群就会灵魂附体,现出原形,即所谓的群表示。具体化需要一个场所,即
由 marketreflections
于 2011-03-14 19:24:11
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