For a one-dimensional system of classical spins with nearest neighbour Heisenberg
interaction we derive the equation of motion for each three-dimensional spin vector. In the …

This paper explains and advocates the use of a Laplace-transform steepest-descent method
for the computation of energy-level densities geE) by inversion of the partition function. The …

We come back to the 1979 controversy about the value of the energy per particleФ, in an
infinite Wigner lattice of electrons in a uniform compensating background. For simplicity we …

DETERMINISTIC LATFICE GAS MODELS Th. W. RUIJGROK and EGD COHEN’ Two lattice
versions ofthe continuouswind-tree whereas for Page 1 Volume 133, number 7,8 PHYSICS …

We consider neural networks of the Hopfield type with couplings J ij which need not be
symmetric. From the master equation for microscopic states we derive an evolution equation for …

In one space and one time dimension, a model of the nonlinear Boltzmann equation is
presented that is exactly solvable for all initial conditions. Furthermore, this model has the …

The Bogoliubov inequality is used to prove the absence of spontaneous magnetic ordering
in one and two dimensions for a many-band model for electrons in a metal interacting via the …

Using a previously developed theory of nematic liquid crystals we present a calculation of
the order parameters and elastic constants for those liquid crystals which consist of disc-like …

We derive equations of motion for a point particle with spin in an external electromagnetic
and in an external scalar field. The derivation is based on the ten conservation laws of linear …

The master equation for a stochastic Ising model with long-range interaction is studied and
the spectrum of the transition matrix is solved exactly in the limit of an infinite system. The …