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Weighted boundedness of a multilinear operator associated to a singular integral operator with general kernels
Journal of Inequalities and Applications volume 2014, Article number: 188 (2014)
Abstract
In this paper, we establish the weighted sharp maximal function inequalities for a multilinear operator associated to a singular integral operator with general kernels. As an application, we obtain the boundedness of the operator on weighted Lebesgue and Morrey spaces.
MSC:42B20, 42B25.
1 Introduction and preliminaries
As the development of singular integral operators (see [1–3]), their commutators and multilinear operators have been well studied. In [4–6], the authors prove that the commutators generated by singular integral operators and BMO functions are bounded on for . Chanillo (see [7]) proves a similar result when singular integral operators are replaced by fractional integral operators. In [8, 9], the boundedness for the commutators generated by singular integral operators and Lipschitz functions on Triebel-Lizorkin and () spaces is obtained. In [10, 11], the boundedness for the commutators generated by singular integral operators and weighted BMO and Lipschitz functions on () spaces is obtained. In [12], some singular integral operators with general kernel are introduced, and the boundedness for the operators and their commutators generated by BMO and Lipschitz functions is obtained (see [8, 12, 13]). Motivated by these, in this paper, we study the multilinear operator generated by the singular integral operator with general kernel and the weighted Lipschitz and BMO functions.
First, let us introduce some notations. Throughout this paper, Q denotes a cube of with sides parallel to the axes. For any locally integrable function f, the sharp maximal function of f is defined by
where, and in what follows, . It is well known that (see [1, 2])
Let
For , let and .
For , and the non-negative weight function w, set
We write if .
The weight is defined by (see [1]), for ,
and
Given a non-negative weight function w, for , the weighted Lebesgue space is the space of functions f such that
For and the non-negative weight function w, the weighted Lipschitz space is the space of functions b such that
and the weighted BMO space is the space of functions b such that
Remark (1) It has been known that (see [11, 14]), for , and ,
-
(2)
It has been known that (see [2, 14]), for , and ,
-
(3)
Let or and . By [14], we know that spaces or coincide and the norms or are equivalent with respect to different values .
Definition 1 Let φ be a positive, increasing function on , and there exists a constant such that
Let w be a non-negative weight function on and f be a locally integrable function on . Set, for ,
where . The generalized weighted Morrey space is defined by
If , , then , which is the classical Morrey space (see [15, 16]). If , then , which is the weighted Lebesgue space (see [1]).
As the Morrey space may be considered as an extension of the Lebesgue space, it is natural and important to study the boundedness of the operator on the Morrey spaces (see [17–20]).
In this paper, we study some singular integral operators as follows (see [12]).
Definition 2 Let be a linear operator such that T is bounded on and has a kernel K, that is, there exists a locally integrable function on such that
for every bounded and compactly supported function f, where K satisfies
and there is a sequence of positive constant numbers such that for any ,
where and . Moreover, let m be a positive integer and b be a function on . Set
The multilinear operator related to the operator T is defined by
Note that the classical Calderón-Zygmund singular integral operator satisfies Definition 1 (see [1–3, 5, 6]) and that the commutator is a particular operator of the multilinear operator if . The multilinear operator is a non-trivial generalization of the commutator. It is well known that commutators and multilinear operators are of great interest in harmonic analysis and have been widely studied by many authors (see [21–23]). The main purpose of this paper is to prove the sharp maximal inequalities for the multilinear operator . As application, we obtain the weighted -norm inequality and Morrey space boundedness for the multilinear operator .
2 Theorems and lemmas
We shall prove the following theorems.
Theorem 1 Let T be a singular integral operator as in Definition 2, the sequence , , , and for all α with . Then there exists a constant such that, for any and ,
Theorem 2 Let T be a singular integral operator as in Definition 2, the sequence , , , , and for all α with . Then there exists a constant such that, for any and ,
Theorem 3 Let T be a singular integral operator as in Definition 2, the sequence , , and for all α with . Then is bounded from to .
Theorem 4 Let T be a singular integral operator as in Definition 2, the sequence , , , and for all α with . Then is bounded from to .
Theorem 5 Let T be a singular integral operator as in Definition 2, the sequence , , , , and for all α with . Then is bounded from to .
Theorem 6 Let T be a singular integral operator as in Definition 2, the sequence , , , , , and for all α with . Then is bounded from to .
To prove the theorems, we need the following lemmas.
Lemma 1 (see [[1], p.485])
Let and for any function , we define that, for ,
where the sup is taken for all measurable sets Q with . Then
Lemma 2 (see [12])
Let T be a singular integral operator as in Definition 2, the sequence . Then T is bounded on for with , and weak bounded.
Let , , and . Then
Lemma 4 (see [1])
Let and . Then, for any smooth function f for which the left-hand side is finite,
Let , , and . Then, for any smooth function f for which the left-hand side is finite,
Let , , , and . Then
Lemma 7 (see [22])
Let b be a function on and for all α with and any . Then
where is the cube centered at x and having side length .
3 Proofs of theorems
Proof of Theorem 1 It suffices to prove for and some constant that the following inequality holds:
Fix a cube and . Let and , then and for . We write, for and ,
then
For , noting that , w satisfies the reverse of Hölder’s inequality,
for all cube Q and some (see [1]). We take in Lemma 7 and have and . Then by Lemma 7 and Hölder’s inequality, we get
Thus, by the -boundedness of T (see Lemma 2) for and , we obtain
For , by the weak boundedness of T (see Lemma 2) and Kolmogoro’s inequality (see Lemma 1), we obtain
For , noting that for and , we write
For , by the formula (see [22])
and Lemma 7, we have, similar to the proof of ,
and
Thus, by , we get
For , we take such that . Recalling and , we get
Similarly, we have, for , with and ,
Thus
These complete the proof of Theorem 1. □
Proof of Theorem 2 It suffices to prove for and some constant that the following inequality holds:
Fix a cube and . Similar to the proof of Theorem 1, we have, for and ,
For and , by using the same argument as in the proof of Theorem 1, we get
Thus
For , we have
and
Thus, for with and , with and , we obtain
This completes the proof of Theorem 2. □
Proof of Theorem 3 Choose in Theorem 1 and notice , then we have, by Lemmas 3 and 4,
This completes the proof of Theorem 3. □
Proof of Theorem 4 Choose in Theorem 1 and notice , then we have, by Lemmas 5 and 6,
This completes the proof of Theorem 4. □
Proof of Theorem 5 Choose in Theorem 2 and notice , then we have, by Lemmas 3 and 4,
This completes the proof of Theorem 5. □
Proof of Theorem 6 Choose in Theorem 2 and notice , then we have, by Lemmas 5 and 6,
This completes the proof of Theorem 6. □
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Feng, Q. Weighted boundedness of a multilinear operator associated to a singular integral operator with general kernels. J Inequal Appl 2014, 188 (2014). https://doi.org/10.1186/1029-242X-2014-188
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DOI: https://doi.org/10.1186/1029-242X-2014-188