title: Population density functions:  a differential equation approach.
abstract: "This paper introduces a new mathematical technique to describe population density functions.  Two length scales, which characterize the variation of these density functions within a region, are identified.  A differential equation is derived and asymptotic solutions obtained.  Two specific techniques, the method of matched asymptotic expansions and the method of multiple scales, are introduced and illustrated by application to population densities at both the metropolitan and regional levels."
authors.forename: A G
authors.initials: AG
authors.lastname: Nairn
authors.forename: G J
authors.initials: GJ
authors.lastname: O'neill
mesh_terms: D003710:Demography; D005843:Geography; D008722:Methods; D008962:Models, Theoretical; D011153:Population; D011156:Population Density; D012106:Research; D014505:Urban Population
keywords: Demographic Analysis; Geographic Factors; Mathematical Model; Methodological Studies; Models, Theoretical; Population; Population Density; Research Methodology; Spatial Distribution; Urban Population; World