Before revision: Renormalizability Higher-order terms can be straightforwardly computed for the evolution operator, but these terms display diagrams containing the following simpler ones Newvertion 17/02/23 BzL.org that, being closed loops, imply the presence of diverging integrals having no mathematical meaning.
After revision: Renormalizability Higher-order terms can be straightforwardly computed for the evolution operator, but these terms display diagrams containing the following simpler ones that, being closed loops, imply the presence of diverging integrals having no mathematical meaning.