In this article we compute analytically the number of Nash Equilibria (NE) for a two-choice game played on (circular) ladder graph with $2n$ players. We consider set games generic payoff parameters, only requirement that NE occurs if players choose opposite strategies (anti-coordination game). The results show both, and circular ladder, grows exponentially (half) $n$, as $N_{NE}(2n)\sim C(\varp...

We study nonlinear effects in the QED ladder Schwinger-Dyson(SD) equation. Without further approximations, we show that all nonlinear effects in the ladder SD equation can be included in the effective couplings and how a linear approximation works well. The analyses is generalized in the case of the improved ladder calculation with the Higashijima-Miransky approximation. The dynamical symmetry ...

BACKGROUND The MacArthur Scale of Subjective Social Status intend to measure the subjective social status using a numbered stepladder image. This study investigated the reliability of the MacArthur scale in a subsample of the Brazilian Longitudinal Study of Adult Health (ELSA-Brasil). METHOD Three scales were employed using different references: 1) the overall socioeconomic position; 2) the s...