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Hello, I'm looking at the following computation from the Peskin and Schroeder's book:

In the second page, the second term that's being integrated, I don't understand why it has a negative i in the exponential, that'll keep the energy term the same, but will swap the sign of the spatial terms, wouldn't it?

Thank you beforehand

*See file attached*In the second page, the second term that's being integrated, I don't understand why it has a negative i in the exponential, that'll keep the energy term the same, but will swap the sign of the spatial terms, wouldn't it?

Thank you beforehand