This paper studies deterministic consensus networks with discrete-time dynamics under persistent flows and non-reciprocal agent interactions. An arc describing the interaction strength between two agents is said to be persistent if its weight function has an infinite l1 norm. We discuss two balance conditions on the interactions between agents which generalize the arc-balance and cut-balance co...

The present study examined to what extent the number of friends and their social and personal characteristics were related to peer victimization in adolescence. Participants were 2,180 adolescents (1,143 girls), aged 11-18 (M = 14.2), who were classified as victims, bully-victims, or non-involved (i.e., adolescents who neither bullied others nor were victimized by others). Three types of friend...

Reciprocal customers may disproportionately improve the performance of markets for experience goods. Reciprocal customers reward (punish) ...rms for providing good (bad) quality by upholding (terminating) the customer relation. This may induce ...rms to provide good quality. Reciprocal customers can be social multipliers in two ways. First, reciprocal customers cause a positive externality for ...

Darwinian selection should preclude cooperation from evolving; yet cooperation is widespread among organisms. We show how kin selection and reciprocal altruism can promote cooperation in diverse 2×2 matrix games (prisoner's dilemma, snowdrift, and hawk-dove). We visualize kin selection as non-random interactions with like-strategies interacting more than by chance. Reciprocal altruism emerges f...

We show that two-dimensional non-Hermitian photonic crystals made of lossy material can exhibit non-trivial point gap topology in terms topological winding its complex frequency band structure. Such be either isotropic media which is reciprocal, or magneto-optical non-reciprocal. discuss the effects reciprocity on properties topology. also such a leads to skin effect when crystal truncated. In ...

Abstract Recently, non-reciprocal systems have become a focus of growing interest. Examples occur in soft and active matter, but also engineered quantum materials neural (brain) networks. Here, we investigate the impact non-reciprocity on collective behavior system (dry) chiral matter. Specifically, consider mixture ‘circle swimmers’ with steric interactions alignment couplings. Based hydrodyna...