I'm trying to figure out what the summation notation of

1. Oct 13, 2011

stevenham

I'm trying to figure out what the summation notation of

(1-x1)^θ * (1-x2)^θ * .....(1-xn)^θ would be for summation

I know I need to convert this to a summation notation in order to solve my problem, but I can't figure out how to convert it. Any help will be appreciated.

2. Oct 14, 2011

Staff: Mentor

Re: Summation

As you have written this, it's not a sum - it's a product. In a summation, the terms are added. In a product, the factors are multiplied.

For example, you can write 12*22*32*...*n2 as a product like this:
$$\prod_{k=1}^n n^2$$