一個數學符號的意思:－線上遊戲排行榜2013/2014,進擊的巨人線上看,candy crush saga外掛,正妹寫真三圍

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一個數學符號的意思

Aug 25th 2013, 03:54

是用於集合上面的嗎？如果是的話它表示“屬於”

例如 X 是一個1~10當中偶數的集合，也就是說X = {2, 4, 6, 8, 10}

那麼 2是裡頭的一個元素，我們就會寫 2 ∈ X

如果寫 a ∈ X，那麼表示 a 是 2 4 6 8 10 當中的其中一個元素

ps 如果∈ 符號上面一個條斜線劃掉，就表示不屬於

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