推 yuweima:這...連內文都沒有= =+ 02/11 12:01
推 Coralwms:好簡單的空白文 02/14 02:47
推 yahchwen:更強的是回文~ 連個答案都沒有 03/03 02:36
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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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