This question arose after I saw a youtube-vid where Grandi's series was discussed.
It seems that the sum of the series will be 0 for an even, and 1 for an odd number of terms, where a term is defined as (-1)n, n indicating the n'th term.
It seems that even when s is derived that the above tacit assumptions of even/odd is used.
Is it valid to make these assumptions?
(My lay-opinion is that these assumptions are wrong, and therefor also the derived value of s (= 1/2), and that the series has no sum as stated in the wikipedia entry)