Volume 97, Issue 3, May 1973

## $p$-adic curvature and cohomology of discrete subgroups of $p$-adic groups

Pages 375-423 by Howard Garland

## On isotopies of homeomorphisms of Riemann surfaces

Pages 424-439 by Joan S. Birman, Hugh M. Hilden

## On modular forms of half integral weight

Pages 440-481 by Goro Shimura

## On local solvability of linear partial differential equations

Pages 482-498 by Richard Beals, Charles Fefferman

## Homomorphismes “abstraits” de groupes algébriques simples

Pages 499-571 by Armand Borel, Jacques Tits