Volume 134, Issue 1, July 1991

## Transcendence and special zeta values in characteristic $p$

Pages 1-23 by Jing Yu

## Gamma functions for function fields and Drinfeld modules

Pages 25-64 by Dinesh S. Thakur

## The theory of weights and the Dirichlet problem for elliptic equations

Pages 65-124 by Robert A. Fefferman, Carlos E. Kenig, Jill PIpher

## Rational subgroups of biautomatic groups

Pages 125-158 by Stephen M. Gersten, Hamish B. Short

## The $E(2,A)$ sections of $\mathrm{SL}(2,A)$

Pages 159-188 by Douglas L. Costa, Gordon E. Keller

## Divergence-free fields: energy and asymptotic crossing number

Pages 189-229 by Michael H. Freedman, Zheng-Xu He