DC Field | Value | Language |
---|---|---|
dc.contributor.author | Ahn, J | ko |
dc.contributor.author | Kwak, Sijong | ko |
dc.date.accessioned | 2013-03-11T00:17:40Z | - |
dc.date.available | 2013-03-11T00:17:40Z | - |
dc.date.created | 2012-02-06 | - |
dc.date.created | 2012-02-06 | - |
dc.date.created | 2012-02-06 | - |
dc.date.issued | 2011-04 | - |
dc.identifier.citation | JOURNAL OF ALGEBRA, v.331, no.1, pp.243 - 262 | - |
dc.identifier.issn | 0021-8693 | - |
dc.identifier.uri | http://hdl.handle.net/10203/97773 | - |
dc.description.abstract | Let X be a reduced closed subscheme in P(n). As a slight generalization of property N(p) due to Green-Lazarsfeld, one says that X satisfies property N(2,p) scheme-theoretically if there is an ideal I generating the ideal sheaf J(X)/P(n) such that I is generated by quadrics and there are only linear syzygies up to p-th step (cf. Eisenbud et al. (2005) [8], Vermeire (2001) [20]). Recently, many algebraic and geometric results have been proved for projective varieties satisfying property N(2,p) (cf. Choi, Kwak, and Park (2008) [6], Eisenbud et al. (2005) [8], Kwak and Park (2005) [15]). In this case, the Castel-nuovo regularity and normality can be obtained by the blowing-up method as reg(X) <= e + 1 where e is the codimension of a smooth variety X (cf. Bertram, Ein, and Lazarsfeld (2003) [3]). On the other hand, projection methods have been very useful and powerful in bounding Castelnuovo regularity, normality and other classical invariants in geometry (cf. Beheshti and Eisenbud (2010) [2] Kwak (1998) [14], Kwak and Park (2005)[15], Lazarsfeld (1987) [16]. We first prove the graded mapping cone theorem on partial eliminations as a general algebraic tool to study syzygies of the non-complete embedding of X. For applications, we give an optimal bound on the length of zero-dimensional intersections of X and a linear space L in terms of graded Betti numbers. We also deduce several theorems about the relationship between X and its projections with respect to the geometry and syzygies for a projective scheme X satisfying property N(2,p) scheme-theoretically. In addition, we give not only interesting information on the regularity of fibers of the projection for the case of N(d,p), d >= 2, but also geometric structures for projections according to moving the center. (C) 2010 Elsevier Inc. All rights reserved. | - |
dc.language | English | - |
dc.publisher | ACADEMIC PRESS INC ELSEVIER SCIENCE | - |
dc.title | Graded mapping cone theorem, multisecants and syzygies | - |
dc.type | Article | - |
dc.identifier.wosid | 000288143700014 | - |
dc.identifier.scopusid | 2-s2.0-79952008638 | - |
dc.type.rims | ART | - |
dc.citation.volume | 331 | - |
dc.citation.issue | 1 | - |
dc.citation.beginningpage | 243 | - |
dc.citation.endingpage | 262 | - |
dc.citation.publicationname | JOURNAL OF ALGEBRA | - |
dc.identifier.doi | 10.1016/j.jalgebra.2010.07.030 | - |
dc.contributor.localauthor | Kwak, Sijong | - |
dc.contributor.nonIdAuthor | Ahn, J | - |
dc.type.journalArticle | Article | - |
dc.subject.keywordAuthor | Linear syzygies | - |
dc.subject.keywordAuthor | Graded mapping cone | - |
dc.subject.keywordAuthor | Castelnuovo-Mumford regularity | - |
dc.subject.keywordAuthor | Partial elimination ideal | - |
dc.subject.keywordPlus | PROJECTIVE VARIETIES | - |
dc.subject.keywordPlus | LINEAR SYZYGIES | - |
dc.subject.keywordPlus | CASTELNUOVO | - |
dc.subject.keywordPlus | CURVES | - |
dc.subject.keywordPlus | NORMALITY | - |
dc.subject.keywordPlus | REGULARITY | - |
dc.subject.keywordPlus | EQUATIONS | - |
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