Dear all, Dimensional regularization is a very important technique to remove the divergence from momentum integrals. Suppose that you have to calculate a quantity composed of three integrals over k_1, k_2 and k_3 (each one is three dimensional). the integral over k_3 gives ultra violet divergence. Whereas, the remained integrals give finite numbers. I have some questions: 1) Can we play with these integrals (performing change of variables or calculating one or two of these integrals) before performing dimensional regularization? 2) Can we transform these 3 integrals into one dimensional integrals that is divergent and then do the dimensional regularization? Thanks in advance. Best regards.