2 problems

Let $S_2$ denote the two-point function defined by the paper's non-perturbative formula for the $bbda \phi^4_D$ theory, and let a Nevanlinna–Sokal disk be given by the condition…

Determinantal positivity conjecture. The matrix $M$ is positive for every $D>0$. The conjecture is immediate for integer $D$ and is known for $q=2$, but the paper notes that positi…