graph and the positivity of the Green function of the corresponding Dirichlet problem. … 3.1], we interpret the differential equation (1) on a graph as a set of differential equationson the edges of the graph and a set of matching conditions at the interior vertices. … The results of the present paper were reported at the seminar on qualitative theory of differential equations at Moscow State University on October 31, 2014. …
Abstract
We find a relationship between the weak nonoscillation of an equation on a graph and the positivity of the Green function of the corresponding Dirichlet problem.