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arXiv 0903.2235math.ACmath.AG
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关于局部上同调模的消失性,artinian性和有限性

On the vanishing, artinianness and finiteness of local cohomology modules

Moharram Aghapournahr, Leif Melkersson

摘要:

设$R$是诺特环,$\fa$是$R$的理想,$M$是$R$ --模.证明了对有限模$M$,若$\LC^{i}_{\fa}(M)$对所有$i\geq r\geq 1$是minimax,则$\LC^{i}_{\fa}(M)$对$i\geq r$是artinian.给出了极大极小局部上同调模的局部-整体原理。如果$\LC^{i}_{\fa}(M)$对于$i\leq r$是共原子的($M$有限),则$\LC^{i}_{\fa}(M)$对于$i\leq r$是有限的。给出了局部极大极小模成为极大极小模的条件。证明了局部上同调模的一个非零定理和几个消灭定理.

英文摘要:

Let $R$ be a noetherian ring, $\fa$ an ideal of $R$, and $M$ an $R$--module. We prove that for a finite module $M$, if $\LC^{i}_{\fa}(M)$ is minimax for all $i\geq r\geq 1$, then $\LC^{i}_{\fa}(M)$ is artinian for $i\geq r$. A Local-global Principle for minimax local cohomology modules is shown. If $\LC^{i}_{\fa}(M)$ is coatomic for $i\leq r$ ($M$ finite) then $\LC^{i}_{\fa}(M)$ is finite for $i\leq r$. We give conditions for a module, which is locally minimax to be a minimax module. A non-vanishing theorem and some vanishing theorems are proved for local cohomology modules.

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