Somewhere I encountered a summation in which the upper and lower bounds were infinity and negative infinity, respectively. I've looked but can't find anything about that online... I asked my Calc II teacher about it today and he that kind of thing would probably be covered in an "advanced calculus" course. Would any of you knowledgeable mathematical people care to inform me a little about this type of summation? And so you know, I'm familiar with infinite series, so I have a little background in the idea of summations...