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Feb 15, 2022 at 19:40 vote accept Max Lonysa Muller
Feb 15, 2022 at 16:47 comment added Max Lonysa Muller Ah I see! Interesting result
Feb 15, 2022 at 16:32 comment added FusRoDah @Max Muller Yes, that is correct. What I did there is just reversing the two summations, so the summand itself stays unchanged. And exactly because there is no $r$, we can simplify to the single sum.
Feb 15, 2022 at 10:16 comment added Max Lonysa Muller Thank you! Minor nitpick: is there maybe a small typo in the second equality for $A$? There the inner sum goes from $r=1$ to $r=n-1$, but there's no $r$ in the summands
Feb 14, 2022 at 22:35 history answered FusRoDah CC BY-SA 4.0