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I am trying to solve this problem, but I do not understand what is meant bythe following expression being minimised

$$ D = P_{k} + P_{j} $$

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  • $\begingroup$ Can you type in the whole sentence? $\endgroup$ – Git Gud Nov 16 '13 at 15:41
  • $\begingroup$ For each pair $(j,k)$ the expression $|P_k-P_j|$ has some value. Find the pair for which this value is smallest. $\endgroup$ – copper.hat Nov 16 '13 at 15:42
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A value is minimised when it becomes as small as it can.

I expect that your $P_k$ and $P_j$ are points. Then $\|P_k-P_j\|$ is the distance between any two points. To minimise $\|P_k-P_j\|$ is to find the two points that are closest to one another out of all the other possible pairs of points.

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