ARKIV
F0R MATEMATIK
Volume 45 Number 2 October 2007
CONTENTS
197 GERASSIMOS BARBATIS
Boundary decay estimates for solutions of fourth-order elliptic equations 221 ILIA BINDER • MARK BRAVERMAN • MICHAEL YAMPOLSKY
On the computational complexity of the Riemann mapping 241 MARCO D'ANNA • MARCO FONTANA
The amalgamated duplication of a ring along a multiplicative-canonical ideal 253 VLADIMIR EZHOV • GERD SCHMALZ
Elliptic CR-manifolds and shear invariant ordinary differential equations with additional symmetries
269 HERVE GAUSSIER • JOEL MERKER
Erratum to "A new example of a uniformly Levi degenerate hypersurface in C3 "
273 JOSE M. GIRAL • FRANCESC PLANAS-VILANOVA A note on the acyclicity of the Koszul complex of a module 279 MASAYUKI HIROKADO • HIROYUKI ITO • NATSUO SAITO
Calabi-Yau threefolds arising from fiber products of rational quasi-elliptic surfaces, I
297 JONATAN LENELLS
Riemannian geometry on the diffeomorphism group of the circle 327 SATOSHI MURAI
Generic initial ideals and exterior algebraic shifting of the join of simplicial complexes
337 STEFANIE PETERMICHL • BRETT D. WICK
A weighted estimate for the square function on the unit ball in Cn
351 AMOL SASANE • SERGEI TREIL
Estimates in corona theorems for some subalgebras of 381 DAVID SWANSON
Area, coarea, and approximation in Wl , l
