关于四面体曲线的局部上同调
On local cohomology of a tetrahedral curve
摘要:
证明了四面体曲线第一局部上同调模$C= C(a_1,...,a_6)$的直径$\diam (H^1_\mfr(R/I))$可以用$a_i$显式表示,并且是使得$\mfr^k H^1_\mfr(R/I)=0$的最小非负整数$k$。由此可以描述所有的算术Cohen-Macaulay或Buchsbaum四面体曲线。
英文摘要:
It is shown that the diameter $\diam (H^1_\mfr(R/I))$ of the first local cohomology module of a tetrahedral curve $C= C(a_1,...,a_6)$ can be explicitly expressed in terms of the $a_i$ and is the smallest non-negative integer $k$ such that $\mfr^k H^1_\mfr(R/I)=0$. From that one can describe all arithmetically Cohen-Macaulay or Buchsbaum tetrahedral curves.
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