## Contents of Volume 55, Number 191

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- Parallel multilevel preconditioners
- James H. Bramble, Joseph E. Pasciak and Jinchao Xu PDF
- Math. Comp.
**55**(1990), 1-22

- Optimal-order nonnested multigrid methods for solving finite element equations. I. On quasi-uniform meshes
- Shangyou Zhang PDF
- Math. Comp.
**55**(1990), 23-36

- Linear elliptic difference inequalities with random coefficients
- Hung Ju Kuo and Neil S. Trudinger PDF
- Math. Comp.
**55**(1990), 37-53

- Boundedness of dispersive difference schemes
- Donald Estep, Michael Loss and Jeffrey Rauch PDF
- Math. Comp.
**55**(1990), 55-87

- Viscous splitting for the unbounded problem of the Navier-Stokes equations
- Lung-An Ying PDF
- Math. Comp.
**55**(1990), 89-113

- A direct boundary element method for Signorini problems
- Hou De Han PDF
- Math. Comp.
**55**(1990), 115-128

- A differential delay equation arising from the sieve of Eratosthenes
- A. Y. Cheer and D. A. Goldston PDF
- Math. Comp.
**55**(1990), 129-141

- Local convergence theory of inexact Newton methods based on structured least change updates
- José Mario Martínez PDF
- Math. Comp.
**55**(1990), 143-167

- Rayleigh quotient iteration for nonsymmetric matrices
- Steve Batterson and John Smillie PDF
- Math. Comp.
**55**(1990), 169-178

- On computations with dense structured matrices
- Victor Pan PDF
- Math. Comp.
**55**(1990), 179-190

- A characterization theorem for the discrete best monotonic approximation problem
- I. C. Demetriou PDF
- Math. Comp.
**55**(1990), 191-195

- Convergence of extended Lagrange interpolation
- Giuliana Criscuolo, Giuseppe Mastroianni and Donatella Occorsio PDF
- Math. Comp.
**55**(1990), 197-212

- Convergence properties of a class of product formulas for weakly singular integral equations
- Giuliana Criscuolo, Giuseppe Mastroianni and Giovanni Monegato PDF
- Math. Comp.
**55**(1990), 213-230

- Linear combinations of orthogonal polynomials generating positive quadrature formulas
- Franz Peherstorfer PDF
- Math. Comp.
**55**(1990), 231-241

- On estimates for the weights in Gaussian quadrature in the ultraspherical case
- Klaus-Jürgen Förster and Knut Petras PDF
- Math. Comp.
**55**(1990), 243-264

- Numerical evaluation of Cauchy principal value integrals with singular integrands
- Philip Rabinowitz PDF
- Math. Comp.
**55**(1990), 265-275

- Lower bounds for the discrepancy of inversive congruential pseudorandom numbers
- Harald Niederreiter PDF
- Math. Comp.
**55**(1990), 277-287

- Error estimates arising from certain pseudorandom sequences in a quasirandom search method
- Ricardo A. Mitchell PDF
- Math. Comp.
**55**(1990), 289-297

- Sieved partition functions and $q$-binomial coefficients
- Frank Garvan and Dennis Stanton PDF
- Math. Comp.
**55**(1990), 299-311

- On the computation of a table of complex cubic fields with discriminant $D>-10^ 6$
- Gilbert W. Fung and H. C. Williams PDF
- Math. Comp.
**55**(1990), 313-325

- A deterministic algorithm for solving $n=fu^ 2+gv^ 2$ in coprime integers $u$ and $v$
- Kenneth Hardy, Joseph B. Muskat and Kenneth S. Williams PDF
- Math. Comp.
**55**(1990), 327-343

- Quadratic polynomials which have a high density of prime values
- G. W. Fung and H. C. Williams PDF
- Math. Comp.
**55**(1990), 345-353

- Explicit bounds for primality testing and related problems
- Eric Bach PDF
- Math. Comp.
**55**(1990), 355-380

- Largest known twin primes
- B. K. Parady, Joel F. Smith and Sergio E. Zarantonello PDF
- Math. Comp.
**55**(1990), 381-382

- The Carmichael numbers to $10^ {12}$
- Gerhard Jaeschke PDF
- Math. Comp.
**55**(1990), 383-389

- Reviews and Descriptions of Tables and Books
- Math. Comp.
**55**(1990), 391-405

- Corrigenda
- Math. Comp.
**55**(1990), 407-409