[QE-developers] Dealing with 1/|r-r'|

[Duy Le]

Dear all,

I want to evaluate, in real space, an double integral that involved
1/|r-r'| and couple wave-functions. I wonder if you faced
similar calculations before and what is the best practice to deal with it
to avoid divergence at r=r'.

Many thanks.
Duy Le (UCF)
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