User blog comment:LittlePeng9/ITTM galore/@comment-65.26.80.144-20140319173225/@comment-25418284-20140321064240

more trolling

S = 1 + 2 + 4 + 8 + ...

2S = 2 + 4 + 8 + 16 + ...

2S = S - 1

S = -1