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屬於&包含於
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Brian Hu
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Aug 16, 2013, 12:43:41 AM
8/16/13
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to zjh...@googlegroups.com
不好意思,我有個很基本的問題
屬於跟包含於我一直搞不清處
到底什麼時候可以用屬於,什麼時候可以用包含於?
我以為屬於是元素對集合,A = {a, b, c},所以 a
∈ A
集合對集合用包含於,A =
{a, b, c}, B = {a, b},所以 B ⊆ A
如果是這樣的話,∅是空集合,所以也是集合,但是
∅
∈ {
∅, {
∅}}卻是對的
請問我哪裡錯了呢?
月戀星辰
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Aug 16, 2013, 7:36:08 AM
8/16/13
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您好:
您的觀念沒錯,但我們都知道集合可以收集任意東西,所以集合裡面也可以有集合。 這種情況下就會出現「某個集合屬於另一個集合」的情況
空集合包含於任意集合,所以也包含於
{
∅, {
∅}} 中。
空集合屬於
{
∅, {
∅}},是因為
{
∅, {
∅}}裡面有
∅ 元素。
以上淺見
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