[請益] subset和proper subset的分別- 看板logic - 批踢踢實業坊
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推MathTurtle:subset = proper subset OR the same set 09/20 00:28. 推mikechan:A is a proper subset of B iff A包含於B butA不等於B 09/20 00:29.
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作者yvonliu()看板logic標題[請益]subset和propersubset的分別時間SunSep2000:22:202009
我剛用關鍵字搜尋板上文章
後來又跑到精華區查好像沒有發現我要的答案
如果有相關文章請直接告訴我在哪我手邊只有英文書所以不知道翻譯後是甚麼樣子
請見諒
以下是問題
請問AisapropersubsetofB
和
AisasubsetofB有甚麼不同?
謝謝
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推MathTurtle:subset=propersubsetORthesameset09/2000:28
推mikechan:AisapropersubsetofBiffA包含於BbutA不等於B09/2000:29
→mikechan:andA不等於空集合09/2000:29
→mikechan:上面那一行好像不對sorry09/2000:34
推LeoSW:可以是空吧但不可以等於原集合09/2007:22
→yvonliu:那假設A={1,2}B={1,2,3}這種情況A是B的propersubset嗎?09/2008:52
推LeoSW:是的。
(有錯請指正)09/2010:35
→yvonliu:那subset和propersubset的分別在於?09/2011:56
推LeoSW:propersubset不可以是自己subset可以(前面有推文了)09/2020:19
→yvonliu:但是我看的書有區分這兩個耶還用不同符號表示09/2023:51
→yvonliu:所以我才會覺得很納悶...09/2023:51
推LeoSW:對啊這兩個不一樣...一個可以是原set一個不行09/2100:32
→yvonliu:唉呀原來是我眼殘沒看清楚推文謝謝了!09/2115:35
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