CONTENTS
Singular points and limit cycles of planar polynomial vector fields.
BY ILIA ITENBERG AND EUGENII SHUSTIN . . . 1
A topological reconstruction theorem for ^""-modules.
BY FABIENNE PROSMANS AND JEAN-PIERRE SCHNEIDERS . . . 39
A nonremovable generic 4-ball in the unit sphere of C3.
BY B. JORICKE AND N. SHCHERBINA . . . 87 Group actions on S6 and complex structures on P^. BY ALAN T.
HUCKLEBERRY, STEFAN KEBEKUS, AND THOMAS PETERNELL . . . 101 Solutions, spectrum, and dynamics for Schrodinger operators on infinite
domains. BY A. KISELEV AND Y. LAST . . . 125 The Griffiths group of a general Calabi-Yau threefold is not
finitely generated. BY CLAIRE VOISIN . . . 151