>> Yes that was my point, "grouping" in any way is invalid because you must
>> make assumptions about the total number of terms, which you can't for an
>> infinite list.
>
> I don't think that's how it works. (If it were, then that original "proof"
> would be invalid from the get-go, because it's grouping elements and
> summing those groups.)

There's no grouping like you did in the original proof. Which part of 
the original proof assumes the length of the summation is anything other 
than infinite?

Welcome back BTW :-)

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