Contents
275 The average value of divisor sums in arithmetic progressions
V. BLOMER
287 Plane curve diagrams and geometrical applications
F. S. DIAS AND J. J. NUNO-BALLESTEROS
311 Simultaneous diophantine approximation by square-free numbers
RAINER DIETMANN
321 Powers of operators dominated by strictly singular operators
JULIO FLORES, FRANCISCO L. HERNANDEZ AND PEDRO TRADACETE
335 Deformations of hypercomplex structures associated to Heisenberg groups
GUEO GRANTCHAROV, HENRIK PEDERSEN AND YAT SUN POON
363 Orthogonally additive polynomials on C*-algebras
C. PALAZUELOS, A. M. PERALTA AND I. VILLANUEVA
375 Alperin's conjecture for algebraic groups
GERHARD ROHRLE AND RAPHAEL ROUQUIER
379 Bialgebras and caterpillars
W. TURNER
389 Scaled asymptotics for some q-series
RUIMING ZHANG