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六星鑽石會員
2011-3-19 17:45#1
我想問如果某個subset is open wrt to toplogical basis,
個subset係唔係都會open wrt to the toplogy generated by that toplogical basis???
thx -
版主
2011-3-22 23:30#2
舉條例子...:smilie_O_o:
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VIP會員
2011-3-23 09:12#3
兩者有分別嗎?