A Zamolodchikov 1986 c-theorem 2D-RG-monotonic; modern modern foundational + a-theorem 4D Komargodski-Schwimmer 2011 generalization.
A Zamolodchikov 1986 c-theorem 2D-RG-monotonic; modern modern foundational + a-theorem 4D Komargodski-Schwimmer 2011 generalization.