output
20022008
most citedSub-milliarcsecond Imaging of Quasars and Active Galactic Nuclei III. Kinematics of Parsec-Scale Radio Jets

424 citations

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24 papers · 1 filter

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.AC2008

Compositions of consistent systems of rank one discrete valuation rings

William J. Heinzer, Louis J. Ratliff, David E. Rush

Let V be a rank one discrete valuation ring (DVR) on a field F and let L/F be a finite separable algebraic field extension with [L:F] = m. The integral closure of V in L is a Dedek…

math.AC20082 cited

Computing j-multiplicity

Koji Nishida, Bernd Ulrich

The j-multiplicity is an invariant that can be defined for any ideal in a Noetherian local ring . It is equal to the Hilbert-Samuel multiplicity if the ideal is -primary…

math.AC2008

The Goto numbers of parameter ideals

William Heinzer, Irena Swanson

Let Q be a parameter ideal of a Noetherian local ring (R,m). The Goto number g(Q) of Q is the largest integer g such that Q:m^g is integral over Q. We examine the values of g(Q) as…

math.AC2007

Projective equivalence of ideals in Noetherian integral domains

William J. Heinzer, Louis J. Ratliff, David E. Rush

Let I be a nonzero proper ideal in a Noetherian integral domain R. In this paper we establish the existence of a finite separable integral extension domain A of R and a positive in…

math.AC2007

Conjugacy classes and invariant subrings of R-automorphisms of R[x]

Jebrel M. Habeb, Mowaffaq Hajja, William J. Heinzer

We consider the group G of R-automorphisms of the polynomial ring R[x] especially in the case where R is the ring of integers modulo n. We describe conjugacy classes in G, and in t…