## Contents of Volume 23, Number 1

HTML articles powered by AMS MathViewer

- Miscellaneous back pages, Bull. Amer. Math. Soc. (N.S.), Volume 23, Number 1 (1990)
- Bull. Amer. Math. Soc.
**23**(1990)

- Notes on invariant subspaces
- Hari Bercovici PDF
- Bull. Amer. Math. Soc.
**23**(1990), 1-36

- Miscellaneous front pages, Bull. Amer. Math. Soc. (N.S.), Volume 23, Number 1 (1990)
- Bull. Amer. Math. Soc.
**23**(1990)

- Old and new conjectured diophantine inequalities
- Serge Lang PDF
- Bull. Amer. Math. Soc.
**23**(1990), 37-75

- Towards computerized proofs of identities
- Herbert S. Wilf and Doron Zeilberger PDF
- Bull. Amer. Math. Soc.
**23**(1990), 77-83

- Splittings of surfaces
- Richard K. Skora PDF
- Bull. Amer. Math. Soc.
**23**(1990), 85-90

- Heegaard surfaces in Haken 3-manifolds
- Klaus Johannson PDF
- Bull. Amer. Math. Soc.
**23**(1990), 91-98

- Not all links are concordant to boundary links
- T. D. Cochran and K. E. Orr PDF
- Bull. Amer. Math. Soc.
**23**(1990), 99-106

- Deformation rigidity for subgroups of $SL\left ( {n,{\mathbf {Z}}} \right )$ acting on the $n$-torus
- Steven Hurder PDF
- Bull. Amer. Math. Soc.
**23**(1990), 107-113

- A nonlinear extension of the Borel density theorem: Applications to invariance of geometric structures and to smooth orbit equivalence
- Alessandra Iozzi PDF
- Bull. Amer. Math. Soc.
**23**(1990), 115-120

- Finitely generated groups, $p$-adic analytic groups, and Poincaré series
- Marcus P. F. du Sautoy PDF
- Bull. Amer. Math. Soc.
**23**(1990), 121-126

- Ramanujan graphs and Hecke operators
- Arnold K. Pizer PDF
- Bull. Amer. Math. Soc.
**23**(1990), 127-137

- Fundamental solutions and harmonic analysis on nilpotent groups
- A. Nagel, F. Ricci and E. M. Stein PDF
- Bull. Amer. Math. Soc.
**23**(1990), 139-144

- Gorenstein local homomorphisms
- Luchezar L. Avramov and Hans-Bjørn Foxby PDF
- Bull. Amer. Math. Soc.
**23**(1990), 145-150

- The jump is definable in the structure of the degrees of unsolvability
- S. Barry Cooper PDF
- Bull. Amer. Math. Soc.
**23**(1990), 151-158

- The adaption problem for approximating linear operators
- Mark A. Kon and Erich Novak PDF
- Bull. Amer. Math. Soc.
**23**(1990), 159-165

##
Book Reviews

Book reviews do not contain an abstract. You may
download each review in this issue using the links
below.

- Schander bases: Behavior and stability, by P. K. Kamthan and M. Gupta.
- Reviewer: J. R. Retherford

- Review information PDF
- Bull. Amer. Math. Soc.
**23**(1990), 167-173

- Continuous decoupling transformations for linear boundary value problems, by P. M. van Loon.
- Reviewer: Wolfang Wasow

- Review information PDF
- Bull. Amer. Math. Soc.
**23**(1990), 173-178

- Derivatives, nuclei and dimensions on the frame of torsion theories, by Jonathan S. Golan and Harold Simmons.
- Reviewer: P. T. Johnstone

- Review information PDF
- Bull. Amer. Math. Soc.
**23**(1990), 178-182

- Algebraic homotopy, by H. J. Baues.
- Reviewer: Ronald Brown

- Review information PDF
- Bull. Amer. Math. Soc.
**23**(1990), 182-190

- Andreotti-Grauert theory by integral formulas, by Gennadi M. Henkin and Jürgen Leiterer.
- Reviewer: R. Michael Range

- Review information PDF
- Bull. Amer. Math. Soc.
**23**(1990), 190-197

- Interpolation of operators, by Colin Bennett and Robert Sharpley.
- Reviewer: Yoram Sagher

- Review information PDF
- Bull. Amer. Math. Soc.
**23**(1990), 198-205

- Theory of relations, by R. Fraïssé.
- Reviewer: Arnold W. Miller

- Review information PDF
- Bull. Amer. Math. Soc.
**23**(1990), 206-209

- Boundary value problems of finite elasticity, by T. Valent.
- Reviewer: Philippe G. Ciarlet

- Review information PDF
- Bull. Amer. Math. Soc.
**23**(1990), 209-222

- Heat kernels and spectral theory, by E. B. Davies.
- Reviewer: Robert S. Strichartz

- Review information PDF
- Bull. Amer. Math. Soc.
**23**(1990), 222-227

- Stochastic processes with a multidimensional parameter, by M. Dozzi.
- Reviewer: Ely Merzbach

- Review information PDF
- Bull. Amer. Math. Soc.
**23**(1990), 228-230

- Art gallery theorems and algorithms, by Joseph O'Rourke.
- Reviewer: David Avis

- Review information PDF
- Bull. Amer. Math. Soc.
**23**(1990), 230-234

- Huygens' principle and hyperbolic equations, by Paul Günther.
- Reviewer: Bent Ørsted

- Review information PDF
- Bull. Amer. Math. Soc.
**23**(1990), 235-242

- Existentially closed groups, by Graham Higman and Elizabeth Scott.
- Reviewer: Kenneth Hickin

- Review information PDF
- Bull. Amer. Math. Soc.
**23**(1990), 242-249