COMMUNICATIONS IN ALGEBRA
Volume 28, Number 12, 2000Special Issue in Honor of Robin Hartshorne
CONTENTS
Dedication . . . viii Monads on Projective Spaces . . . 5503 G. Fl0ystad
Quartic-Canonical Systems on Canonical Threefolds of Index 1 . . . 5517 S. Lee
On Curve Sections of Rank Two Reflexive S h e a v e s . . . 5531 5'. Nollet, M. Roggero, and P. Valabrega
Pencils of Quadrics, Binary Forms, and Hyperelliptic Curves . . . 5541 D. Avritzer and H. Lange
The Saturation of Frobenius Powers of I d e a l s . . . 5563 C. Huneke
Ample Vector Bundles and Branched Coverings . . . 5573 T. Peternell and A. J. Sommese and appendix by R. Lazarsfeld
Triades et Deformations de Sous-Quotients . . . 5601 M. Martin-Deschamps and D. Perrin
Notes on Flatness and the Quot Functor on Rings . . . 5613 D. Laksov, Y. Pitteloud, and R. M. Skjelnes
Enriques Surfaces and Other Non-Pfaffian Subcanonical
Subschemes of Codimension 3 . . . 5629 D. Eisenbud, S. Popescu, and C. Walter
Curves in the Double P l a n e . . . 5655 R. Hartshorne and E. Schlesinger
Cartier Divisors Versus Invertible S h e a v e s . . . 5677 5'. L. Kleiman
Lifting Monomial I d e a l s . . . 5679 J. Migliore and U. Nagel
vi CONTENTS On Smooth Surfaces in Projective Four-Space Lying on Quartic
Hypersurfaces with Isolated Singularities... 5703 Ph. Ellia and D. Franco
Resolutions of Subsets of Finite Sets of Points in Projective
Space... 5715 5". P. Diaz, A. V. Geramita, andJ. C. Migliore
Hilbert Scheme Components in Characteristic 2... 5735 N. M. Kumar, C. Peterson, and A. P. Rao
A Remark on Connectedness in Hilbert Schemes ... 5745 5'. Nollet
Degree of the Divisor of Solutions of a Differential Equation on
a Projective V a r i e t y . . . 5749 V. Munoz and I. Sols
On Complex n-Folds Polarized by an Ample Line Bundle L
with dim Bs \L\ < 0, g(L) = q(X) + m, and h°(L) > n + m . . . . . 5769 V. Fukuma
Gorenstein Dimension and Torsion of Modules over
Commutative Noetherian R i n g s . . . 5783 V. Ma^ek
Configurations of Singular Fibers on Rational Elliptic Surfaces
in Characteristic Two . . . 5813 W. E. Long
On the Normal Bundle of Curves on Nodal Quartic Surfaces ... 5837 M. R. Gonzalez-Dorrego
Good Failures for Fat Points in P2... 5857 E. Ballico and L. Chiantini
Finiteness Properties of Local Cohomology Modules for Regular Local Rings of Mixed Chalracteristic: The Unramified
C a s e . . . . 5867
G. Lyubeznik
Extensions of Vector Bundles on P' . . . 5883 E. Schlesinger
On Normal Surface Singularities and a Problem ofEnriques . . . 5891 C. Ciliberto and S. Greco
The Multiplier Ideal Is a Universal Test Ideal... 5915 K. E. Smith
CONTENTS vii Linear Systems with Removable Base L o c i . . . 5931 L. Ein
Monomial Resolutions of Morphisms of Algebraic Surfaces . . . 5935 D. Cutkosky and 0. Piltant
Abel Maps and Presentation Schemes . . . 5961 E. Esteves, M. Gagne, and S. Kleiman
On the Geometry of Canonical Curves of Odd G e n u s . . . 5993 C. Ciliberto and E. Sernesi
Un Contre-Exemple sur les Families de Courbes Gauches . . . 6003 5'. Ait-Amrane and D. Perrin
Focal Loci of Algebraic Varieties. I . . . 6017 F. Catanese and C. Trifogli
On the Connectedness of the Hilbert Scheme of Curves in P3. . . 6059 R. Hartshorne
Footnote to a Paper by H a r t s h o r n e . . . 6079 E. Schlesinger
Index to Volume 28 . . . 6085
