# Space Translation

1. Aug 29, 2013

### direct99

Hi,

In Sidney Coleman's Lectures he talked about space translations such that

but when I expanded the exponentials and and used the commutation relation of p and x, I got ρ(x+a) instead of ρ(x-a)

Does anyone see where I may of went wrong?

Last edited: Aug 29, 2013
2. Aug 29, 2013