Home  18.013A  Chapter 6  Section 6.1 


The way mathematicians like to express this statement is as follows: "For every epsilon greater than zero there is a delta such that for
$\leftxx\text{'}\right\text{delta}$
and
$x\text{'}\ne x$
the difference between
$\frac{f(x)f(x\text{'})}{xx\text{'}}$
and the slope of that line is less than epsilon".
This has a tendency to confuse beginners who are put off by the symbols for delta and epsilon as much as they are by the concepts. However it grows on you, apparently.

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