Composition of fractional Orlicz maximal operators and A
1-weights on spaces of homogeneous type |
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Authors: | Ana L Bernardis Gladis Pradolini María Lorente María Silvina Riveros |
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Institution: | 1. IMAL (CONICET)-FIQ (UNL), Güemes, 3450 (3000), Santa Fe, Argentina 2. Departamento de Análisis Matemático, Facultad de Ciencias, Universidad de Málaga, 29071, Málaga, Spain 3. FaMAF Universidad Nacional de Córdoba CIEM (CONICET), 5000, Córdoba, Argentina
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Abstract: | For a Young function Θ with 0 ≤ α < 1, let M
α,Θ be the fractional Orlicz maximal operator defined in the context of the spaces of homogeneous type (X, d, μ) by M
α,Θ
f(x) = sup
x∈B
μ(B)
α
‖f‖Θ,B
, where ‖f‖Θ,B
is the mean Luxemburg norm of f on a ball B. When α = 0 we simply denote it by M
Θ. In this paper we prove that if Φ and Ψ are two Young functions, there exists a third Young function Θ such that the composition
M
α,Ψ ∘ M
Φ is pointwise equivalent to M
α,Θ. As a consequence we prove that for some Young functions Θ, if M
α,Θ
f < ∞ a.e. and δ ∈ (0, 1) then (M
α,Θ
f)
δ
is an A
1-weight. |
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Keywords: | Orlicz maximal function spaces of homogeneous type weights |
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