Boundedness and compactness of Hardy operators on Lorentz-type spaces


Given non-negative measurable functions φ, ψ on Rn we study the high dimensional Hardy operator Hf(x) = ψ(x) ∫B(0,|x|) f(y)φ(y)dy between Orlicz–Lorentz spaces ∧Gx(w), where f is a measurable function of x ∈ Rn and B(0,t) is the ball of radius t in Rn. We give sufficient conditions of boundedness of H : ∧G0u0 → ∧G1u1(w1) and H : ∧G0u0 → ∧G1, ∞u1(w1). We investigate also boundedness and compactness of H :∧p0u0(w0) →p1,q1u1(w1) between weighted and classical Lorentz spaces. The function spaces considered here do not need to be Banach spaces. Specifying the weights and the Orlicz functions we recover the existing results as well as we obtain new results in the new and old settings.

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Mathematische Nachrichten