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中文摘要：
通过分析几种估计增长网络度分布方法的缺点，提出估计度分布的差分方程方法，不仅避免了复杂网络分析中将离散问题连续化带来的逻辑矛盾，也避免了网络稳态度分布存在性的假设．利用这个方法给出Poisson增长择优连接网络的度分布公式，借助Poisson过程理论和Gamma分布的性质严格证明Poisson增长择优连接网络是无标度网络．
英文摘要：
The difference equation approach of estimating degree distribution in growing networks was proposed after analyzing the disadvantages of some existing approaches. This approach avoids not only logic conflicts brought by continuum of discrete problem, but also the assumption of existence of the stationary degree distribution in network analysis. The degree distribution formula of Poisson growth and preferenti~d attachment network was obtained by this approach. It was strictly proved that this network is scale-free based on Poisson process theory and properties of Gamma distribution.
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