作者Lawaly ()
看板NTU-K10
标题午聚的照片
时间Fri Dec 12 20:14:45 2008
http://lawaly.pixnet.net/album/set/14423158
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If for every ε>0, there is a number δ>0,
such that |f(x)-L|<ε whenever |x-a|<δ,
then we write lim f(x)=L
x→a
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