Table of contents : Introduction....Pages 1-4 Weighted Sobolev space $$\tilde W^{1,2}$$ ....Pages 7-19 The Dirichlet problem in a half-space....Pages 20-45 The Dirichlet problem in a bounded domain....Pages 46-66 Estimates of derivatives....Pages 67-77 Harmonic measure....Pages 78-89 Exceptional sets on the boundary....Pages 90-103 Applications of the L 2 -method....Pages 104-116 Domains with C 1,α -boundary....Pages 117-130 The space C n−1 ( $$\bar Q$$ )....Pages 131-141 C n−1 -estimate of the solution of the Dirichlet problem with L 2 -boundary data....Pages 142-167