In Principles of QM by Dirac, 4th Ed page102 he gives the following:-(adsbygoogle = window.adsbygoogle || []).push({});

Lim_{δx→0}(De^{iγ}-1)/δx = Lim_{δx→0}(D-1+iγ)/δx

given that the phase factor tends to 1 in the limit

I'm stuck here. My grasp of maths is pretty weak and I can't see how the pure imaginary number arises. Any help would be appreciated.

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# Math step in Dirac's book

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