We consider the integer L-shaped method for two-stage stochastic integer programs. To improve the performance of the algorithm, we present and combine two strategies. First, to avoid timeconsuming exact evaluations of the second-stage cost function, we propose a simple modification that alternates between linear and mixed-integer subproblems. Then, to better approximate the shape of the second-...

In this paper we analyze several first-order systems of Oseen-type equations that are obtained from the time-dependent incompressible NavierStokes equations after introducing the additional vorticity and possibly total pressure variables, time-discretizing the time derivative and linearizing the nonlinear terms. We apply the [L, L, L] least-squares finite element scheme to approximate the solut...

Allowing for gene-environment correlation, Jensen (1975) reports that under a wide range of assumptions, the twin data show that onehalf ~o th~ee-fourths of IQ variance is accounted for by genetic factors. But that conc1usion;~fa11swhen an arbitrary specification is relaxed. ON JENSEN'S METHOD FOR TWINS

Starting from suitable tableaux over finite dimensional Lie algebras, we provide a scheme for producing involutive linear Pfaffian systems related to various classes of submanifolds in homogeneous spaces which constitute integrable systems. These include isothermic surfaces, Willmore surfaces, projective minimal surfaces, and other classical soliton surfaces. Completely integrable equations suc...

One-dimensional δ ′ -function potential is discussed in the framework of Green’s function formalism without invoking perturbation expansion. It is shown that the energy-dependent Green’s function for this case is crucially dependent on the boundary conditions which are provided by self-adjoint extension method. The most general Green’s function which contains four real self-adjoint extension pa...

The classical M / G / l system with vacations has been used to estimate the mean waiting t ime of individual priority classes of homogeneous FDDI networks. To faithfully model the FDDI network using M / G / l system, the vacation interval of the server (token) as seen by individual priority classes must be evaluated. The expressions for the mean waiting time of individual priority classes are f...

X iv :m at h/ 00 12 20 2v 1 [ m at h. A G ] 2 0 D ec 2 00 0 The Moduli Space of Bilevel-6 Abelian Surfaces G.K. Sankaran & J. Spandaw The moduli space Abil t of (1, t)-polarised abelian surfaces with a weak bilevel structure was introduced by S. Mukai in [11]. Mukai showed that Abil t is rational for t = 2, 3, 4, 5. More generally, we may ask for birational invariants, such as Kodaira dimension...

For little q-Jacobi polynomials and q-Hahn polynomials we give particular q-hypergeometric series representations in which the termwise q = 0 limit can be taken. When rewritten in matrix form, these series representations can be viewed as LU factorizations. We develop a general theory of LU factorizations related to complete systems of orthogonal polynomials with discrete orthogonality relation...