[問題] 無聊就來想想吧!
已知:{0,1}屬於S
若x屬於S,則1/x也屬於S
若x,y皆屬於S,則x-y也屬於S
試證:若x,y皆屬於S,則xy也屬於S
若你證不出來,沒關係,我也沒答案 ><
若你證出來了,只能說,你太強大了= =
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