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In the solution of this example, the author uses the following: $$d(0, P)=|r|$$

But what does that notation mean?

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It reads: "the distance (denoted by $d$) from the origin (denoted by $O$) to the point $P$ is $|r|$"

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    $\begingroup$ Thanks. It makes perfect sense now. $\endgroup$ – user1251385 Dec 4 '13 at 17:45
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$o$ is the origin, $P$ is a point, $d$ is the distance, so "distance between the origin and your particle".

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