- #1
zaybu
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In the paper, http://arxiv.org/pdf/1205.3365v1.pdf, page 21, the author argues that if:
t →∞(1-iϵ), all the terms in equation (193) goes to zero, except the first term.
Can anyone explain this to me?
Thanks
t →∞(1-iϵ), all the terms in equation (193) goes to zero, except the first term.
Can anyone explain this to me?
Thanks