2,734 research outputs found
Génesis, clasificación y problemas agronómicos de los barros. Tierra de Barros, Extremadura.
Sin resume
Classical solutions to integral equations with zero order kernels
We show global and interior higher-order log-H\"older regularity estimates
for solutions of Dirichlet integral equations where the operator has a
nonintegrable kernel with a singularity at the origin that is weaker than that
of any fractional Laplacian. As a consequence, under mild regularity
assumptions on the right hand side, we show the existence of classical
solutions of Dirichlet problems involving the logarithmic Laplacian and the
logarithmic Schr\"odinger operator.Comment: We added a lower-order regularity estimate for the logarithmic
Laplacian (Corollary 5.8
When tanß meets all the mixing angles
Models with two-Higgs-doublets and natural flavour conservation contain as a physical parameter. We offer here a generalization of a recently proposed idea where only the Cabibbo angle, , was related to by virtue of the dihedral symmetry group. The original proposal consisted of a massless first generation of quarks and no mixing with the third generation. In our case, through the addition of a third Higgs doublet with a small vacuum-expectation-value but very large masses, thus later decoupling, all quarks become massive and quark mixing is fully reproduced. In fact, all quark mixing angles are expressed in terms of and one recovers trivial mixing in the limit . We also explore the consequences in lepton mixing by adopting a type I seesaw mechanism with three heavy right-handed neutrinos
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