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math.AC2008

Divisors on Rational Normal Scrolls

Andrew R. Kustin, Claudia Polini, Bernd Ulrich

Let be the homogeneous coordinate ring of a rational normal scroll. The ring is equal to the quotient of a polynomial ring by the ideal generated by the two by two mino…

math.AC20071 cited

A characterization of Gorenstein Hilbert functions in codimension four with small initial degree

Juan C. Migliore, Uwe Nagel, Fabrizio Zanello

The main goal of this paper is to characterize the Hilbert functions of all (artinian) codimension 4 Gorenstein algebras that have at least two independent relations of degree four…

math.AC2005

Normalization of Ideals and Briancon-Skoda Numbers

Claudia Polini, Bernd Ulrich, Wolmer V. Vasconcelos

We establish bounds for the coefficient of the Hilbert function of the integral closure filtration of equimultiple ideals. These values are shown to help control all…

math.AC2005

On the componentwise linearity and the minimal free resolution of a tetrahedral curve

Christopher A. Francisco, Juan C. Migliore, Uwe Nagel

A tetrahedral curve is an unmixed, usually non-reduced, one-dimensional subscheme of projective 3-space whose homogeneous ideal is the intersection of powers of the ideals of the s…

math.AC20041 cited

The Multiplicity Conjecture in low codimensions

Juan C. Migliore, Uwe Nagel, Tim Römer

We establish the multiplicity conjecture of Herzog, Huneke, and Srinivasan about the multiplicity of graded Cohen-Macaulay algebras over a field, for codimension two algebras and f…

math.AC200443 cited

A formula for the core of an ideal

Claudia Polini, Bernd Ulrich

The core of an ideal is the intersection of all its reductions. For large classes of ideals I we explicitly describe the core as a colon ideal of a power of a single reduction and…