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
DOI:
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发表时间:
2005
期刊:
影响因子:
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通讯作者:
L. Şega
中科院分区:
文献类型:
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作者:
David A. Jorgensen;L. Şega
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 $i>0$.