1. ## Simple Notation Question

We've been studying series for a while, now, so I'm intimately familiar with the capital sigma sign used to denote the summation of an infinite series.

In a totally different class, I stumbled upon the capital Pi sign used in a similar manner. It looks like this symbol is used for the multiplication of a series? Is that correct?

Thanks.

2. ## Re: Simple Notation Question

a series by definition is an infinite sum. the capital pi is used for an infinite (or finite) product. for example:

$\prod_{k=1}^n k = n!$

3. ## Re: Simple Notation Question

Sorry about the loose use of the terminology. That's the idea that I was getting at.

Thanks!