[代數] 有點混淆的觀念... S_3交集S_2=？(已解決)
餓死抬頭～
請問S_3交集S_2到底是｛id｝還是...？
因為S_3={id, (1 2), (1 3), (2 3), (1 2 3), (1 3 2)}
S_2={id, (1 2)}
讓我搞不太清楚它們的交集到底是 id 還是 id 跟 (1 2)呢？
謝謝。 -_-a
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