Purpose: To estimate the transition rates corresponding to the 2010 and 2012 elections to the Catalan Parliament for the four constituencies in which Catalonia is divided for this purpose. The main features of the results, which are obtained by means of mathematical programming, are commented....

Multiplicity of equilibria is a common problem in many economic models. In general, it is impossible to devise methods that always find all equilibria for any type of model. A notable exception are models in which all equilibria are solutions to a system of polynomial equations since there are...