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Galois module structure of the rings of integers in wildly ramified extensions

Stephen M. J. Wilson — 1989

Annales de l'institut Fourier

The main results of this paper may be loosely stated as follows. Theorem.— Let N and N ' be sums of Galois algebras with group Γ over algebraic number fields. Suppose that N and N ' have the same dimension and that they are identical at their wildly ramified primes. Then (writing 𝒪 N for the maximal order in N ) 𝒪 N 𝒪 N Γ Γ 𝒪 N ' 𝒪 N ' Γ . In...

Some counter-examples in the theory of the Galois module structure of wild extensions

Stephen M. J. Wilson — 1980

Annales de l'institut Fourier

Considering the ring of integers in a number field as a Z Γ -module (where Γ is a galois group of the field), one hoped to prove useful theorems about the extension of this module to a module or a lattice over a maximal order. In this paper it is show that it could be difficult to obtain, in this way, parameters which are independent of the choice of the maximal order. Several lemmas about twisted group rings are required in the proof.

A semi-discrete Littlewood-Paley inequality

J. M. Wilson — 2002

Studia Mathematica

We apply a decomposition lemma of Uchiyama and results of the author to obtain good weighted Littlewood-Paley estimates for linear sums of functions satisfying reasonable decay, smoothness, and cancellation conditions. The heart of our application is a combinatorial trick treating m-fold dilates of dyadic cubes. We use our estimates to obtain new weighted inequalities for Bergman-type spaces defined on upper half-spaces in one and two parameters, extending earlier work of R. L. Wheeden and the author....

Global orthogonality implies local almost-orthogonality.

J. Michael Wilson — 2000

Revista Matemática Iberoamericana

We introduce a new stopping-time argument, adapted to handle linear sums of noncompactly-supported functions that satisfy fairly weak decay, smoothness, and cancellation conditions. We use the argument to obtain a new Littlewood-Paley-type result for such sums.

Weighted inequalities for gradients on non-smooth domains

We prove sufficiency of conditions on pairs of measures μ and ν, defined respectively on the interior and the boundary of a bounded Lipschitz domain Ω in d-dimensional Euclidean space, which ensure that, if u is the solution of the Dirichlet problem. Δu = 0 in Ω, u | Ω = f , with f belonging to a reasonable test class, then ( Ω | u | q d μ ) 1 / q ( Ω | f | p d ν ) 1 / p , where 1 < p ≤ q < ∞ and q ≥ 2. Our sufficiency conditions resemble those found by Wheeden and Wilson for the Dirichlet problem on d + 1 . As in that case we attack the problem by...

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