Hi all !

I am trying to go through this paper (https://arxiv.org/pdf/1803.08823.pdf) but am completely stuck on this integration, page 83, which is not explained and given in one step :

Integration problem-screenshot-2018-4-12-1803-08823-pdf-1-.png

Integration problem-screenshot-2018-4-12-1803-08823-pdf.png

Seems somehow related to the gaussian distribution but I have no idea of the steps.

Thank you very much for your help