Talk:Indexed Summation does not Change under Permutation

Phew! There are different ways to finish the proof; for example one can show that $S_n$ is generated by an $n$-cycle and a transposition. I didn't bother writing out other proofs. --barto (talk) 14:53, 19 October 2017 (EDT)

I changed the argument, because Indexed Summation over Adjacent Intervals turns out to be too much work with so few tools. --barto (talk) 18:01, 19 October 2017 (EDT)