Anzasiscrassicornis Rossi v. nigriventris n. v. (Hym)
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چکیده
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$n$-cocoherent rings, $n$-cosemihereditary rings and $n$-V-rings
Let $R$ be a ring, and let $n, d$ be non-negative integers. A right $R$-module $M$ is called $(n, d)$-projective if $Ext^{d+1}_R(M, A)=0$ for every $n$-copresented right $R$-module $A$. $R$ is called right $n$-cocoherent if every $n$-copresented right $R$-module is $(n+1)$-coprese-nted, it is called a right co-$(n,d)$-ring if every right $R$-module is $(n, d)$-projective. $R$...
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ژورنال
عنوان ژورنال: Deutsche Entomologische Zeitschrift
سال: 1916
ISSN: 0012-0073,1860-1324
DOI: 10.1002/mmnd.48019160108