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## Main Question or Discussion Point

I came across this yesterday when I was looking for equalities between the sums of two summations.
I'm not sure if this is part of a proof or what.

- Thread starter saganforever
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- #1

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I came across this yesterday when I was looking for equalities between the sums of two summations.
I'm not sure if this is part of a proof or what.

- #2

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I'd not come across that before... pretty nice :) Simple yet elegant

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