This is trivial to do, so you don't need a web-reference. But please don't label a justification for 1 - 1/2 + 1/3 - 1/4 + ... = 0. a "proof". People have already deeply bewildered by the recent kerfuffle about whether 1 + 1/2 + 1/3 + 1/4 + ... = -1/12 (following a YouTube video purporting to prove this) to the point that the Wikipedia article on this will not budge on the point that this is merely "true", and Terry Tao remained steadfastly ambiguous on the subject. —Dan
On Sep 9, 2015, at 10:03 AM, James Propp <jamespropp@gmail.com> wrote:
Can anyone provide a favorite web-reference?
For my upcoming Mathematical Enchantments column, I composed a proof that 1 - 1/2 + 1/3 - 1/4 + ... is both positive and zero, but it really doesn't fit into the (already over-long) article, so I'd like to outsource the job of showing "You can get nonsensical results by rearranging conditionally convergent series" to some website that already exists.