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The paper analyzes the limiting case for a modified Yule-Simon model of city growth. The aim of the paper is primarily to reintroduce geographers to the notion of a closed system of cities, i.e., a system of cities where the aggregate population is stationary in size. The Yule-Simon model, while successful in dealing with the observed properties of open systems, is seen to break down for closed systems. Moreover, incorporating Simon's assumptions regarding intercity migration into the model produces implausible results. Also, the traditional approach of employing entropy-maximizing procedures assumes a certain pattern of intercity migration. This pattern, while not inherently implausible, does present features which are questionable. The authors conclude that an adequate theory for closed systems has yet to be developed.  相似文献   
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ABSTRACT

Contrary to Russia’s expectations, military intervention into Ukraine only strengthened the Ukrainian civic nation. As a number of polls demonstrate, since 2014 there is a growing trend that the vast majority of Ukrainians, also in the government-controlled areas of the Donbas, identify themselves, first and foremost, as Ukrainian citizens. Regional and local identity is not their primary choice anymore and there are clear indicators of a strong civic identity that favors a unitary Ukraine. The lack of progress for a solution of the conflict in the Donbas impacts upon Ukrainian public opinion which, in turn, puts pressure on the Ukrainian authorities: there is a wide acceptance of a diplomatic solution to the conflict and readiness for some compromises but the reintegration of the occupied territories should take place according to pre-war conditions, without any federalization of Ukraine. Also, without establishing a stable security regime in the Donbas there is little support for an implementation of the political part of the Minsk-2 agreement. However, closer to the frontline, the more Ukrainians are ready for compromises. The promise of peace by new President Volodymyr Zelenskyy puts a question on what compromises his team may accept and justify in the eyes of Ukrainians.  相似文献   
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