Opie, A.H.; Grindlay, J. - In: Physica A: Statistical Mechanics and its Applications 303 (2002) 1, pp. 119-132
The equilibrium state of a triangular pile of particles, interconnected by linear springs and subjected to the force of gravity, is explored algebraically. A subset of the springs is treated as weak in relation to the others and perturbation theory is used to obtain the zero order and first...