Asymmetric complete resolutions and vanishing of ext overGorenstein rings

Asymmetric complete resolutions and vanishing of ext overGorenstein rings
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戈伦斯坦环上的非对称完全解析和外部消失

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发表时间:
2005
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通讯作者:
L. Şega
L. Şega
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作者:
David A. Jorgensen;L. Şega

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构造了一类允许极小完全R-自由分解的Gorenstein局部环RC$,这样序列${ ank_R C_i}$对于$i 0$是常数。在这些环上,我们证明了存在n-生成的$R$-模$M$和$N$使得$Ext^i_R(M,N)=0$,对所有$i> 0$,但$Ext^i_R(N,M) 对于所有$i>0$,e 0$。
We construct a class of Gorenstein local rings $R$ which admit minimal complete $R$-free resolutions $d C$ such that the sequence ${ ank_R C_i}$ is constant for $i 0$. Over these rings we show that there exist finitely generated $R$-modules $M$ and $N$ such that $Ext^i_R(M,N)=0$ for all $i> 0$, but $Ext^i_R(N,M) e 0$ for all $i>0$.