A remark on projectively closed purities. (English) Zbl 0313.16029


16Exx Homological methods in associative algebras
13C05 Structure, classification theorems for modules and ideals in commutative rings
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[1] А. П. Мишина Л. А. Скорняков: Абелевы группы и модули, Москва. 1969. · Zbl 0224.13015
[2] S. Mac Lane: Homology. Berlin-Göttingen-Heidelberg, 1963.
[3] M. C. R. Butler G. Horrocks: Classes of extensions and resolutions. Philos. Trans. Roy. Soc. London A 254 (1961), 155-222. · Zbl 0099.25902
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