“…The graph is assumed to have semi-infinite bonds r , = (-o o ,0 ), T2,3 = (0,oo), but the main part of our analysis will be numerical, for which we assume finite lengths lk of bonds, with coordinates ti € (-/ 1,0), ?2,3 € (OJ2. 3), and homogeneous Dirichlet boundary conditions at £1 = -£2,3 = Z 2.3. Furthermore, we assume that the solutions…”