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The Dirichlet problem for elliptic systems with data in Köthe function spaces
Martell, JM Mitrea, D Mitrea, I Mitrea, M
Martell, JM
Mitrea, D
Mitrea, I
Mitrea, M
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Journal Article
Date
2016-01-01
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Subject
Dirichlet problem
second-order elliptic system
nontangential maximal function
Hardy-Littlewood maximal operator
Poisson kernel
Green function
Kothe function space
Muckenhoupt weight
Lebesgue space
variable exponent Lebesgue space
Lorentz space
Zygmund space
Orlicz space
Hardy space
Beurling algebra
Hardy-Beurling space
semigroup
Fatou type theorem
second-order elliptic system
nontangential maximal function
Hardy-Littlewood maximal operator
Poisson kernel
Green function
Kothe function space
Muckenhoupt weight
Lebesgue space
variable exponent Lebesgue space
Lorentz space
Zygmund space
Orlicz space
Hardy space
Beurling algebra
Hardy-Beurling space
semigroup
Fatou type theorem
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10.4171/rmi/903
Abstract
© 2016 European Mathematical Society. We show that the boundedness of the Hardy-Littlewood maximal operator on a Kothe function space X and on its Kothe dual X is equivalent to the well-posedness of the X-Dirichlet and X-Dirichlet problems in Rn + in the class of all second-order, homogeneous, elliptic systems, with constant complex coefficients. As a consequence, we obtain that the Dirichlet problem for such systems is well-posed for boundary data in Lebesgue spaces, variable exponent Lebesgue spaces, Lorentz spaces, Zygmund spaces, as well as their weighted versions. We also discuss a version of the aforementioned result which contains, as a particular case, the Dirichlet problem for elliptic systems with data in the classical Hardy space H1, and the Beurling-Hardy space HAp for p € (1,∞). Based on the well-posedness of the Lp-Dirichlet problem we then prove the uniqueness of the Poisson kernel associated with such systems, as well as the fact that they generate a strongly continuous semigroup in natural settings. Finally, we establish a general Fatou type theorem guaranteeing the existence of the pointwise nontangential boundary trace for null-solutions of such systems.
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European Mathematical Society Publishing House
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Revista Matematica Iberoamericana
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