## Contents of Volume 26, Number 1

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- Editors’ remarks: “Some basic information on information-based complexity theory” [Bull. Amer. Math. Soc. (N.S.) 26 (1992), no. 1, 3–27; MR1102755 (94e:68077a)] by B. N. Parlett and “Perspectives on information-based complexity” [Bull. Amer. Math. Soc. (N.S.) 26 (1992), no. 1, 29–52; MR1102756 (94e:68077b)] by J. F. Traub and H. Woźniakowski
- Morris W. Hirsch and Richard S. Palais PDF
- Bull. Amer. Math. Soc.
**26**(1992), 1-2

- Some basic information on information-based complexity theory
- Beresford N. Parlett PDF
- Bull. Amer. Math. Soc.
**26**(1992), 3-27

- Perspectives on information-based complexity
- J. F. Traub and H. Woźniakowski PDF
- Bull. Amer. Math. Soc.
**26**(1992), 29-52

- Semi-linear wave equations
- Michael Struwe PDF
- Bull. Amer. Math. Soc.
**26**(1992), 53-85

- $\Lambda$-trees and their applications
- John W. Morgan PDF
- Bull. Amer. Math. Soc.
**26**(1992), 87-112

- Lifting of cohomology and unobstructedness of certain holomorphic maps
- Ziv Ran PDF
- Bull. Amer. Math. Soc.
**26**(1992), 113-117

- A steepest descent method for oscillatory Riemann-Hilbert problems
- P. Deift and X. Zhou PDF
- Bull. Amer. Math. Soc.
**26**(1992), 119-123

- Nonunique tangent maps at isolated singularities of harmonic maps
- Brian White PDF
- Bull. Amer. Math. Soc.
**26**(1992), 125-129

- Semistability of amalgamated products, HNN-extensions, and all one-relator groups
- Michael L. Mihalik and Steven T. Tschantz PDF
- Bull. Amer. Math. Soc.
**26**(1992), 131-135

- Some nonanalytic-hypoelliptic sums of squares of vector fields
- Michael Christ PDF
- Bull. Amer. Math. Soc.
**26**(1992), 137-140

- Pleating coordinates for the Teichmüller space of a punctured torus
- Linda Keen and Caroline Series PDF
- Bull. Amer. Math. Soc.
**26**(1992), 141-146

##
Book Reviews

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

- Weak convergence methods for nonlinear partial differential equations, by Lawrence C. Evans.
- Reviewers: Michel Chipot and David Kinderlehrer

- Review information PDF
- Bull. Amer. Math. Soc.
**26**(1992), 147-148

- Finsler geometry and applications, by Aurel Bejancu.
- Reviewer: Hanno Rund

- Review information PDF
- Bull. Amer. Math. Soc.
**26**(1992), 148-151

- Unbounded operator algebras and representation theory, by Konrad Schm\"udgen.
- Reviewer: Palle Jorgensen

- Review information PDF
- Bull. Amer. Math. Soc.
**26**(1992), 152-153

- Topics in Nevanlinna theory, by Serge Lang and William Cherry.
- Reviewer: Paul Vojta

- Review information PDF
- Bull. Amer. Math. Soc.
**26**(1992), 153-157

- Set-valued analysis, by Jean-Pierre Aubin and Helene Frankowska.
- Reviewer: Jonathan Borwein

- Review information PDF
- Bull. Amer. Math. Soc.
**26**(1992), 157-160

- Large deviation techniques in decision, simulation, and estimation, by James A. Bucklew.
- Reviewer: Richard S. Ellis

- Review information PDF
- Bull. Amer. Math. Soc.
**26**(1992), 160-171

- Handbook of differential equations, by Daniel Zwillinger.
- Reviewer: Ray Redheffer

- Review information PDF
- Bull. Amer. Math. Soc.
**26**(1992), 171-175

- Retarded dynamical systems: stability and characteristic functions, by G. St\'ep\'an.
- Reviewer: Kenneth L. Cooke

- Review information PDF
- Bull. Amer. Math. Soc.
**26**(1992), 175-179

- Classification theories of polarized varieties, by Takao Fujita.
- Reviewer: Andrew J. Sommese

- Review information PDF
- Bull. Amer. Math. Soc.
**26**(1992), 179-182

- The geometry and physics of knots, by Michael Atiyah.
- Reviewer: Raoul Bott

- Review information PDF
- Bull. Amer. Math. Soc.
**26**(1992), 182-188

- Variational principles of topology. Multidimensional minimal surface theory, by Anatoli\u \i \ T. Fomenko.
- Reviewer: Fred Almgren

- Review information PDF
- Bull. Amer. Math. Soc.
**26**(1992), 188-192

- Induced modules over group algebras, by Gregory Karpilovsky.
- Reviewer: Gerald Cliff

- Review information PDF
- Bull. Amer. Math. Soc.
**26**(1992), 193-195