西北师范大学学报（自然科学版）2013，Vol.49Issue(2)：23-27,5.
n-P-投射模与强-P-投射模
n-P-projective modules and strongly-P-projective modules
摘要
Abstract
Let R be any ring. The concepts of n-P-protective modules and strongly-P-projective modules are introduced. It is shown that M is n-P-projective module if and only if M is a cokernel of a Pn-preenvelope f:A→B with B protective; if R is a left coherent and right perfect ring, then (PP,PP⊥ ) is a perfect cotorsion theory, and (SPP,SPP⊥) is a perfect hereditary cotorsion theory, where PP denotes the class of all P-projective modules, and SPP denotes the class of all strongly-P-projective modules.关键词
n-P-投射模/强P-投射模/(预)包络/余挠理论Key words
n-P-projective module/ strongly-P-projective module/ (pre)envelope/ cotorsion theory分类
数理科学引用本文复制引用
乔虎生,汪涛..n-P-投射模与强-P-投射模[J].西北师范大学学报（自然科学版）,2013,49(2):23-27,5.基金项目
国家自然科学基金资助项目(10901129) （10901129）
教育部博士点专项科研基金资助项目(20096203120001) （20096203120001）
