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Numerical Macaulification in Arbitrary Codimension

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posted on 2018-07-04, 00:00 authored by Erin Suzanne Bela

An ideal J is said to be numerically c-ACM (NACM) if R/J has the Hilbert function of some codimension c ACM subscheme of P^n. We exhibit algorithm which takes an arbitrary ideal and produces, via a finite sequence of basic double links, an ideal which is numerically c-ACM. An immediate consequence of this result is that every even liaison class of equidimensional codimension c subschemes of P^n contains elements which are NACM. This was first proved for the codimension two case by Migliore and Nagel, but was an open question in higher codimension.

Let L denote the even liaison class of three skew lines in P^4, and let L_S be denote the even liaison class of three skew lines on a smooth hypersurface S in P^4 of degree at least two. We also give a complete description of the sequences of basic double links which (in S) produce curves which are NACM. We conclude by showing that the subset of L_S consisting of NACM subschemes, which we denote by M_S, fails to have the Lazarsfeld-Rao property.

History

Date Created

2018-07-04

Date Modified

2018-11-09

Defense Date

2018-05-11

CIP Code

  • PHD-MATH

Research Director(s)

Juan C. Migliore

Degree

  • Doctor of Philosophy

Degree Level

  • Doctoral Dissertation

Alternate Identifier

1051772011

Library Record

004943587

OCLC Number

1051772011

Program Name

  • Mathematics (MATH)

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