# I found something, but I'm not sure what it is. Summation Notation

1. Apr 26, 2009

### saganforever

I came across this yesterday when I was looking for equalities between the sums of two summations. I'm not sure if this is part of a proof or what.

2. Apr 26, 2009

### JG89

To see how this equality is true, remember that the sum of the first n integers is given by the formula: n(n+1)/2

3. Apr 27, 2009