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611 Differentiable
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f is continuous at c if and only if for every ε>0 there exists δ>0 such that |x−c|<δ ⇒ |f(x)−f(c)|<ε.
｢f(x) Ƚx￫c｣ = f(c)
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ᐥA function f:A￫ℝ is differentiable at c if and only if
｢(f(x)−f(c))/(x−c) Ƚx￫c｣
exists.
The value of the limit, called the deriv ...
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