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I was wondering on Newton's Gravity Law derivation, and I found this page: http://www.relativitycalculator.com/Newton_Universal_Gravity_Law.shtml

Everything seems clear, but the first step is just killing me, because I can't get it.

Assuming small incremental changes in s; [tex]

\lim_{t\rightarrow 0} {s} \rightarrow 0

[/tex]

we have the following ratios

[itex]\frac{\omega}{\nu}[/itex]=[itex]\frac{s}{r}[/itex], and [itex]\frac{t}{T}[/itex]=[itex]\frac{s}{2πr}[/itex]

Could someone help me out? Explain, or just say, which part of math do I have to cover in order to understand that?

(btw, I did pre-calculus, and calculus, so concept of limits is familiar to me)

Thanks in advance.

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# Question on gravitation law derivation

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