is a double covering, where C and C are nonsingular complete curves with Jacobians J and 3. The involution 1: C C interchanging sheets extends to t: I J, and up to some points of order two, 3 splits into an even part J and an odd part P, the Prym variety. The Prym P has a natural polarization on it, but only in two cases where 21 has zero or two branch points do we get a unique principal polari...

Axioms ruling linear negation have been investigated in the context of the complete semantics for distributive intuitionistic linear logic. Among these are the condition of being a dualizing element and the one of being a cyclic element. The motivation for analyzing other syntactic constraints comes from the observation that groupoids are models for classical linear logic. The analysis proceeds...

We propose an affine framework for perspective views, captured by a single extremely simple equation based on a viewer-centered invariant we call relative affine structure. Via a number of corollaries of our main results we show that our framework unifies previous work — including Euclidean, projective and affine — in a natural and simple way, and introduces new, extremely simple, algorithms fo...

We study nonsingular minimal surfaces of general type with pg = 6 and K2 = 13 whose canonical image is contained in a single nonsingular quadric. We show that under these assumptions, such surfaces are regular and their canonical ideal has codimension 3. Led by Buchsbaum–Eisenbud’s structure theorem, we define a map of S into a weighted Grassmannian, which factors through an embedding of the ca...

ion and Generalization of 3D structure for recognition in large intra-class variation Gowri Somanath and Chandra Kambhamettu Video/Image Modeling and Synthesis (VIMS) Lab, Department of Computer and Information Sciences, University of Delaware, Newark, DE, USA. http://vims.cis.udel.edu Abstract. Humans have abstract models for object classes which helps recognize previously unseen instances, de...

We examine a modified 2 × 2 game of Hex in which the winner of each cell is determined by a Tullock contest. The player establishing a winning path of cells in the game wins a fixed prize. Examining the polar cases of all cells being contested simultaneously versus all four cells being contested sequentially, we show that there is an increase in the total expected payoff for the players in the ...

We use experiments to test comparative statics predictions of canonical tournament theory. Both the roles of principal and agent are populated by human subjects, allowing us to test predictions for both incentive responses and optimal tournament design. Consistent with theory, we observed an incentive effect from raising the winner’s prize. However, we also observed several empirical puzzles th...

In this article we prove the existence of a canonical theta structure for the canonical lift of an ordinary abelian variety.

James Allen defined a calculus of time intervals by ident i fying time intervals as pairs of real numbers, and considering binary relations that can hold between such pairs [Alll83]. We call this the Interval Calculus. We consider the system of interval time units defined in [Lad86.2] (the T U S ) , which was intended for the natural representation of real clock time on any scale. We introduce ...

It is well known that proposers have an advantage in the canonical model of bargaining in legislatures: proposers are sure of being part of the coalition that forms, and, conditional on being in a coalition, a player receives more as a proposer than as a coalition partner. In this paper I show that, if parties di¤er in voting weight, it is possible for a party to donate part of its proposing pr...