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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?

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

but when I expanded the exponentials

Does anyone see where I may of went wrong?

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