[問題] 請問極限正式定義

[kahuna (開心鬼期待Friday)]

我的課本只有一段 formally, limits are defined as follows:

lim f(x)=L  if for every number e > 0
x-c

there is a number t > 0 such that |f(x)-L|< e whenever 0 <|x-c|< t

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→ Quitequiet:定義不就是只有這樣 = =???