城市位序-规模问题的分形理论初探——Zipf定律的理论来源、异化形式及其统一基础
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摘要
从城市动力系统的一般模型出发,引出城市体系异速生长的Beckmann方程并将其推广到一般形式,同时导出城市规模分布的Pareto公式,从而建立了Zipf定律的理论基础;讨论了城市位序—规模问题的分形性质和退化形式,进而证明了Davis二倍数规律与Mandelbrot的三参数Zipf公式等价,并修正了Curry最大熵模型,得到城市体系等级结构的Weibul公式。
An allometric equation of urban systems and its Beckmann’s form were deduced from the equations of general urban dynamic systems,and the Pareto′s formula of city-size distribution can be obtained out of the mathematical transformation,based on which the theoretical foundations can be laid for Zipf′s Law of urban geography.The fractal nature of rank-size rule of cities and its degenerational form were discussed,Davis′ double law (2n-law) was proved equivalent to Zipf′s formula with three parameters,and Curry′s greatest entropy model was revised,which gave a Weibull′s formula for size distribution of cities in a region.
引文
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