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Residual intersections of Licci ideals are Glicci

Residual intersections of licci ideals are glicci
Authors: Hartshorne, Robin; Huneke, Craig; Ulrich, Bernd;

Residual intersections of Licci ideals are Glicci

Abstract

The main result of this paper states that residual intersections of licci ideals in a local Gorenstein ring \((R,\text{ m})\) are strictly glicci, hence glicci. Unfortunately the proof of this nice result does not carry over to the homogeneous case where only a somewhat weaker result holds. Two proper ideals \(I\) and \(J\) in \(R\) are said to be linked with respect to an ideal \(K\) if \(J= K:I\) and \(I=K:J\); they are \(CI\)-linked (resp. \(G\)-linked) if \(K\) is a complete intersection (resp. Gorenstein) ideal. These notions generate the equivalence relation \(CI\)-liaison (resp. \(G\)-liaison). Then \(I\) licci (resp. glicci) means that \(I\) is in the \(CI\)- (resp. \(G\)-) linkage class of a complete intersection, while strictly glicci means glicci in the ring \(R/(y_1,\dots,y_t)\) for every \(t \geq 0\) and every \(R\)-sequence \(y_1,\dots,y_t\) that is regular on \(R/I\). Moreover if \(I\) is a proper ideal in \(R\) of height \(ht(I)=g\) and \(K\) an ideal minimally generated by \(s \geq g\) elements contained in \(I\), then \(J := K:I\) is called an \(s\)-residual intersection of \(I\) provided \(J\) is a proper ideal of height at least \(s\). A residual intersection \(J\) of a Cohen-Macaulay ideal \(I\) may fail to be unmixed or Cohen-Macaulay, unlike what happens under \(G\)- and \(CI\)-linkage. Indeed \(H_{\text{ m}}^i(R/J)=0\) for \(0 \leq i < \dim R/I\) if \(J\) is \(G\)-linked to \(I\) (see [\textit{P.\ Schenzel}, J.\ Math.\ Kyoto Univ.\ 22 , 485--498, (1982; Zbl 0506.13012)]), and through several theorems one is led to ask whether every Cohen-Macaulay ideal is glicci for \(R\) regular (cf. [\textit{J. O. Kleppe}, Mem. Am. Math. Soc. 732, 116 p. (2001; Zbl 1006.14018)]). Let \(J\) be an \(s\)-residual intersection of \(I\) and let \(y_1,\dots,y_t\), \(t \geq 0\), be an \(R\)-sequence that is regular on \(R/J\). The authors have to prove several theorems to get their main result, e.g. they first need to modify the licci ideal \(I\) within its \(CI\)-linkage class without changing \(J\) such that \(y_1,\dots,y_t\) becomes an \(R/I\)-sequence and so that \(I\) has the property \(G_s\): stating that the number of minimal generators of \(I_p\) is at most \(\dim R_p\) for every prime \(p \in V(I)\) with \(\dim R_p \leq s-1\). Once having the ideal \(I\) with the property \(G_s\) then \(J\) is under some assumptions modified within its even \(G\)-liaison class without changing \(I\), and finally, a sequence of tight double links (called basic double links in geometry) brings \(J\) closer to a complete intersection in such a way that one may conclude by induction on the number of double links of \(I\) leading to a complete intersection. The paper also contains a discussion and give examples showing that the theory of linkage in local rings does not in general pass over to the corresponding theory of homogeneous ideals in projective geometry.

Keywords

licci, glicci, Linkage, 13C40, linkage, liaison, Linkage, complete intersections and determinantal ideals, 14M06, Gorenstein, Cohen-Macaulay

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
1
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