In this paper we consider continuity properties of a stochastic heat equation of the form [not partial differential]u(t,x)/[not partial differential]t = [not partial differential]2u(t,x)/[not partial differential]x2 + f(u(t,x))Wx,t. We prove that the solutions of this equation depend...

In this paper, necessary and sufficient conditions for an asset substitution matrix to be symmetric for all distributions of rates of return are derived. It is found that symmetry in this context is essentially equivalent to the proposition that the von Neumann-Morgenstern utility function...

Regionale Einzelhandelskonzepte gehören zu den informellen Instrumenten der räumlichen Planung. Sie vermitteln zwischen örtlichen und überörtlichen Interessen, sie schaffen Brücken zwischen Landes- und Regionalplanung einerseits und kommunaler Bauleitplanung andererseits. Mit regionalen...

The year 2008 represents an important historical milestone. For the first time, over half of the world's population 3.3 billion people live in urban areas. This significant increase in urban population has resulted from both natural population growth and rural to urban migration. It is important...

Los trabajos sobre áreas urbanas tropiezan con la dificultad de delimitar con cierta precisión el alcance de las mismas. No existe un consenso entre los estudiosos de los procesos de urbanización sobre la manera de definirlas y, en consecuencia, hay varias alternativas. La mayoría de...

The year 2008 represents an important historical milestone. For the first time, over half of the world's population 3.3 billion people live in urban areas. This significant increase in urban population has resulted from both natural population growth and rural to urban migration. It is important...