## Contents of Volume 334, Number 1

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- Transfinite graphs and electrical networks
- A. H. Zemanian PDF
- Trans. Amer. Math. Soc.
**334**(1992), 1-36

- Isotropy groups of homotopy classes of maps
- G. Triantafillou PDF
- Trans. Amer. Math. Soc.
**334**(1992), 37-48

- The classification of complete minimal surfaces with total curvature greater than $-12\pi$
- Francisco J. López PDF
- Trans. Amer. Math. Soc.
**334**(1992), 49-74

- Subcriticality and gaugeability of the Schrödinger operator
- Z. Zhao PDF
- Trans. Amer. Math. Soc.
**334**(1992), 75-96

- QED domains and NED sets in $\mathbf {\overline {R}}^ n$
- Shan Shuang Yang PDF
- Trans. Amer. Math. Soc.
**334**(1992), 97-120

- Mixed groups
- Paul Hill and Charles Megibben PDF
- Trans. Amer. Math. Soc.
**334**(1992), 121-142

- Central extensions of current algebras
- Paul Zusmanovich PDF
- Trans. Amer. Math. Soc.
**334**(1992), 143-152

- Subgroup conditions for groups acting freely on products of spheres
- Judith H. Silverman PDF
- Trans. Amer. Math. Soc.
**334**(1992), 153-181

- Meromorphic extension of analytic continued fractions across their divergence line with applications to orthogonal polynomials
- Hans-J. Runckel PDF
- Trans. Amer. Math. Soc.
**334**(1992), 183-212

- Characteristic cycles of holomorphic discrete series
- Jen-Tseh Chang PDF
- Trans. Amer. Math. Soc.
**334**(1992), 213-227

- On conjugacy separability of fundamental groups of graphs of groups
- M. Shirvani PDF
- Trans. Amer. Math. Soc.
**334**(1992), 229-243

- Fundamental solutions for hypoelliptic differential operators depending analytically on a parameter
- Frank Mantlik PDF
- Trans. Amer. Math. Soc.
**334**(1992), 245-257

- Delta methods in enveloping algebras of Lie superalgebras
- Jeffrey Bergen and D. S. Passman PDF
- Trans. Amer. Math. Soc.
**334**(1992), 259-280

- Generalized second-order derivatives of convex functions in reflexive Banach spaces
- Chi Ngoc Do PDF
- Trans. Amer. Math. Soc.
**334**(1992), 281-301

- Nonnegative curvature on piecewise constant curvature spaces
- Robert Peszek PDF
- Trans. Amer. Math. Soc.
**334**(1992), 303-315

- Strong Tutte functions of matroids and graphs
- Thomas Zaslavsky PDF
- Trans. Amer. Math. Soc.
**334**(1992), 317-347

- $\Sigma _ n$ definable sets without $\Sigma _ n$ induction
- C. T. Chong and K. J. Mourad PDF
- Trans. Amer. Math. Soc.
**334**(1992), 349-363

- Cohomological aspects of hypergraphs
- F. R. K. Chung and R. L. Graham PDF
- Trans. Amer. Math. Soc.
**334**(1992), 365-388

- Algebra for Heckoid groups
- Robert Riley PDF
- Trans. Amer. Math. Soc.
**334**(1992), 389-409

- Universal spaces for $\textbf {R}$-trees
- John C. Mayer, Jacek Nikiel and Lex G. Oversteegen PDF
- Trans. Amer. Math. Soc.
**334**(1992), 411-432

- Geometric aspects of reduction of order
- James Sherring and Geoff Prince PDF
- Trans. Amer. Math. Soc.
**334**(1992), 433-453

- Stable-homotopy and homology invariants of boundary links
- Michael Farber PDF
- Trans. Amer. Math. Soc.
**334**(1992), 455-477