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格序模f-张量积函子的正合性与平坦格序模 被引量:3
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作者 周伟 《四川师范大学学报(自然科学版)》 CAS CSCD 1992年第3期52-57,共6页
本文证明了如下结果:设M是有单位元可换格序环R上的格序模和l-模同态范畴,F是R上的f-模和l-模同态范畴,M∈M,则F=M(?)()是M 到F 的共变函子,进而是右正合函子.设R 是有单位元的可换全序环,视R 为自身上的格序模,则R 是平坦的.
关键词 f-张量积函子 序模正合列 右正合函子 平坦格序模
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平行格,平坦格与可拆格
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作者 李双杰 魏利 《河北大学学报(自然科学版)》 CAS 1997年第3期62-63,共2页
讨论了平坦格、平行格与可拆格之间的关系,主要结果为定理1和定理4。
关键词 平行 平坦格 可拆
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F─模的投射分解与格序模直和的平坦性
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作者 周伟 《哈尔滨师范大学自然科学学报》 CAS 1996年第2期16-17,共2页
本文给出了F─模的投射分解并证明了格序模直和平坦的充要条件。
关键词 F-模 投射分解 平坦格序模 序模 直和 平坦
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Price and retailer's service level decision in a supply chain under consumer returns 被引量:3
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作者 刘健 王海燕 《Journal of Southeast University(English Edition)》 EI CAS 2013年第2期217-221,共5页
To investigate the optimal retail price and service level in a supply chain under consumer returns, a consumer returns model under the retailer's service provision is built. The optimal decision results and optimal p... To investigate the optimal retail price and service level in a supply chain under consumer returns, a consumer returns model under the retailer's service provision is built. The optimal decision results and optimal profits are obtained in the vertical integration game and the manufacturer Stackelberg game, respectively. Through comparing the optimal profits with service provision with those of no service provision, the boundary conditions that the retailer's service should be provided are derived. The results show that in the manufacturer Stackelberg game, the optimal profit of the retailer and the manufacturer with service is always superior to that of a no service provision. However, in the vertical integration game, the supply chain can only benefit from the service under certain conditions. Finally, through numerical examples, the impacts of the cost for providing services and the consumer return rate on the optimal decisions are analyzed. 展开更多
关键词 pricing decision service level consumer returns Stackelberg game vertical integration
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