Includes bibliographical references.

An inverse problem and spectral invariants for billiards ; Spherical functions and transforms on finite upper half planes: eigenvalues of the combinatorial Laplacian, uncertainty, traces ; ^p spectral geometry ; An ^p spectral bootstrap theorem ; Finite part of spectrum and isospectrality ; Nonexistence of universal upper bounds for the first positive eigenvalue of the LaplaceBeltrami operator ; Convergence of the eigenvalues of Laplacians in a class of finite graphs ; Isospectral closed Riemannian manifolds which are not locally isometric. II ; The length spectrum and representation theory on two and threestep nilpotent Lie groups ; A few remarks on the billiard ball problem ; Hyperbolic cusp forms and spectral simplicity on compact hyperbolic surfaces ; Inverse boundary problems on Riemannian manifolds ; Spectral theory of the differential Laplacian on the modified Koch curve ; Conjugate geodesic flows in negatively curved manifolds ; Varietes isospectrales et representations de groupes ; On differences of eigenvalues for flat tori and hyperbolic surfaces ; Combinatorics of free product graphs ; A discrete analogue of periodic magnetic Schrodinger operators Edoh Y Amiran ; Jeff Angel Steve Poulos Audrey Terras Cindy Trimble and Elinor Velasquez ; Robert Brooks ; Robert Brooks and Paul Glezen ; Xianzhe Dai and Guofang Wei ; Jozef Dodziuk ; Koji Fujiwara ; Carolyn S Gordon ; Ruth Gornet ; Eugene Gutkin ; Lizhen Ji and Steven Zelditch ; Yaroslav Kurylev ; Leonid Malozemov ; Yiping Mao ; Hubert Pesce ; Yiannis N Petridis ; Gregory Quenell ; Toshikazu Sunada