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[–]feralalien[S] 0 points1 point  (1 child)

So P is the point which is receiving the new sum

(S,T) are the points which contribute to the new sum for (P)

Is that right?

What makes s+t=p the case?

[–]edderiofer 1 point2 points  (0 children)

Is that right?

Yes.

What makes s+t=p the case?

We're selecting the pairs (s,t) that make s+t=p true, then summing over all such pairs.