ABSTRACT
While computing radiative corrections in Chapters 6 and 7, we encountered three QED diagrams with ultraviolet divergences: https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9780429494178/44f502a7-e2c6-4c6a-8ca2-080da987514d/content/fig10_315_1.tif"/>
