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Zero-cycles on self-product of modular curves
We use the elements in K -cohomology groups which are constructed by Flach and Mildenhall to obtain a finiteness result for the torsion part of the...
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The minimal height of quadratic forms of given dimension
Given an arbitrary n , we consider anisotropic quadratic forms of dimension n over all fields of characteristic ≠ 2 and prove that the height of an n -d...
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The Chern Character of a Parabolic Bundle, and a Parabolic Corollary of Reznikov’s Theorem
In this paper, we obtain an explicit formula for the Chern character of a locally abelian parabolic bundle in terms of its constituent bundles.... -
Specialization of the torsion subgroup of the Chow group
An example is given in which specialization is not injective.
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Deforming Curves in Jacobians to Non-Jacobians I: Curves in C (2)
We introduce deformation theoretic methods for determining when a curve X in a nonhyperelliptic Jacobian JC will deform with JC to a non-Jacobian. We...
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Deforming Curves in Jacobians to Non-Jacobians II: Curves in C(e), 3⩽ e ⩽ g−3*
We introduce deformation theoretic methods for determining when a curve X in a nonhyperelliptic Jacobian JC will deform with JC to a non-Jacobian. We...
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Boundaries of varieties in projective manifolds
We give a characterization of the boundaries of holomorphic chains in complex projective space. This extends previous work of the authors and...
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Polygonal cycles in higher Chow groups of Jacobians
The aim of this paper is to construct non-trivial cycles in the first higher Chow group of the Jacobian of a curve having special torsion points. The...
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Indecomposable cycles on special quartics in ℙ3
In this note we give an example of an indecomposable higher Chow cycle on a special family of quartics in ℙ 3 . The example is obtained as an...
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On the first Witt index of quadratic forms
We prove Hoffmann’s conjecture determining the possible values of the first Witt index of anisotropic quadratic forms of any given dimension. The...
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Cycles and Spectra
Some recent work on spaces of algebraic cycles is surveyed. The main focus is on spaces of real and quaternionic cycles and their relation to...
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A Semiregularity Map for Modules and Applications to Deformations
We construct a general semiregularity map for algebraic cycles as asked for by S.Bloch in 1972. The existence of such a semiregularity map has well...
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Cycle Spaces of Real Forms of SLn(ℂ)
Let us introduce the notation and goals of this paper in the context of an example. For this let the complex Lie group G ℂ = SL3(ℂ) act... -
Relations Among Heegner Cycles on Families of Abelian Surfaces
We compute relations of rational equivalence among special codimension 2 cycles on families of Abelian surfaces using elements of a higher Chow...
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Some variants of the logarithm
We construct certain extensions of Hodge structures using points on algebraic curves and study them. We also introduce and use a related function...
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Subvarieties of Abelian Varieties
We discuss various constructions which allow one to embed a principally polarized abelian variety in the jacobian of a curve. Each of these gives...