慎選帽子...

[Lawaly (投球會開始噴了喔)]

http://s29.yousendit.com/d.aspx?id=2FHKLP3DF1J4V2F4LW93OA60RG

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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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