Journal club on the proof of the a-theorem \ \ http://arxiv.org/abs/1107.3987 \ On Renormalization Group Flows in Four Dimensions \ Zohar Komargodski, Adam Schwimmer \ \ http://arxiv.org/abs/1205.3994 \ On renormalization group flows and the a-theorem in 6d \ Henriette Elvang, Daniel Z. Freedman, Ling-Yan Hung, Michael Kiermaier, Robert C. Myers, Stefan Theisen \ \ http://arxiv.org/abs/1204.5221 \ The $a$-theorem and the Asymptotics of 4D Quantum Field Theory \ Markus A. Luty, Joseph Polchinski, Riccardo Rattazzi