Published by Duke University Press since its inception in 1935, the Duke Mathematical Journal is one of the world's leading mathematical journals. Without specializing in a small number of subject areas, it emphasizes the most active and influential areas of current mathematics.

### Volume 150, Number 1

#### Publication Date: 1 October 2009

A duality exact sequence for legendrian contact homology

Tobias Ekholm, John B. Etnyre and Joshua M. Sabloff; 1-75

Zero loci of admissible normal functions with torsion singularities

Patrick Brosnan and Gregory Pearlstein; 77-100

Pour toute surface hyperbolique de genre $g$, $\lambda_{2g-2}> 1/4$

Jean-Pierre Otal and Eulalio Rosas; 101-115

Loop products and closed geodesics

Mark Goresky and Nancy Hingston; 117-209