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Rotman J J. An Introductions to Homological Algebra[M]. New York:Academic Press,1979.收稿日期:2009-03-25基金项目：国家自然科学基金(60474022)和四川省教育厅科研基金(10ZC058)资助项目作者简介：陈子春(1970—),男,副教授,主要从事智能信息处理方向的研究
