市区郡分割を考慮した選挙区画定問題の最適化モデル
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概要
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Let me consider the political redistricting problem for the single seat constituency system in the House of Representatives. In Japan, city is the smallest unit as one component of the electoral district. So basically it is prohibited to split the city for redictricting. However, in order to reduce the vote-value disparity it is approved as a special case. In fact, over 20 cities were divided for redrawing the electoral districts. Nemoto and Hotta[3, 4] treated this exception rule by proposing the prepreallocationmethod, which apportions the average population via a single seat of the prefecture as one district. In this research, I propose the mathematical model with adjusting the population of the divided city, and compare with the pre-allocation method.