Abstract
In this paper, we investigate the boundedness of commutators of matrix Hausdorff operator on the weighted p-adic Herz-Morrey space with the symbol functions in weighted central bounded mean oscillations (BMO) and Lipschitz spaces. In addition, a result showing boundedness of Hausdorff operator on weighted p-adic -central BMO spaces is provided as well.
1. Introduction
Let p be a fixed prime and x be a nonzero rational number. If x can be represented in the form where the integers and fixed prime p are coprime to each other then where If then we have The p-adic absolute value satisfies all conditions of norm along with the following two extra properties:
The symbol denotes the field of p-adic numbers and is the completion of the field of rational number with respect to ultrametric p-adic norm In [1], it was shown that any can be expressed in the canonical form as:
where The series (2) converges in p-adic norm because one has
The space consists of points where If then the following definition of norm is used on
Let us express
the ball with center at and radius . In a same manner, express by
the sphere with center at and radius . When we merely represent and Also, for every and .
Since is a locally compact commutative group under addition, therefore, there exists a Haar measure on , such that
where denotes the Haar measure of a subset B of and B is measurable. In addition, an easy computation yields , , for any .
The p-adic analysis has gained a lot of attention in the past few decades due to its importance in mathematical physics and its usefulness in science and technology (see, for instance, [2,3,4,5]). It is a fact that the theory of function from into play a vital role in p-adic quantum mechanics [1]. In the last few years, many researchers have taken interest in the study of harmonic and wavelet analysis over p-adic fields which resulted in a number of reseach items, for instance, see [6,7,8].
The Hausdorff operator is considered very important in harmonic analysis due to its relation with the summability of classical Fourier series (see e.g., [9,10]). The matrix Hausdorff operator with kernel function in Euclidean space was studied by Lerner and Liflyand in [11] and is of the form
where is invertible matrix for almost everywhere in the support of If the kernel function is chosen wisely then the Hausdorff operator reduces to some classical operators like the Hardy operator, the adjoint Hardy operator, the Hardy-Littlewood averaging operator and the Cesàro operator. Here we would like to mention some important publications including [11,12,13,14,15,16,17,18,19,20,21,22,23,24] which discussed the boundedness of Hausdorff operator on function spaces.
On the other hand, the p-adic matrix Hausdorff operator was introduced by Volosivets [25], which is given by
where is locally integrable function on and is nonsingular matrix for almost everywhere in the support of . In recent times, the boundedness of the Hardy operator and the Hausdorff operator on p-adic field has become point of discussion for many authors (see, for instance, [26,27,28,29,30]). In [29], the Hausdorff operator was studied on weighted p-adic Morrey and Herz type spaces where, by imposing special conditions on the norm of the matrix sharp estimates were also obtained.
The boundedness properties of commutator operators is also an important aspect of harmonic analysis as these are useful in the study of characterization of function spaces and regularity theory of partial differential equations. The commutator of Hausdorff operator with locally integrable function b is given by
The boundedness of the analog of on and its special cases when were discussed in [31,32,33,34,35,36,37]. However, this topic still needs further considerations in the sense of its boundedness on p-adic function spaces.
In this paper, we will mainly discuss the boundedness of on p-adic weighted Herz type spaces when b is either from or In addition an intermediate result stating the boundedness of p-adic matrix Hausdorff operator on -central bounded mean oscillations (BMO) spaces will be given at first.
2. Preliminaries and the Main Results
Suppose is a weight function on which is nonnegative and locally integrable function on Let be the space of all complex-valued functions f on such that:
If , we will write
Definition 1.
Let and . The space is defined as follows.
where
Remark 1.
When , the space is just reduced to with corresponding norm given as follows.
Definition 2.
Suppose , the weighted Herz space is defined by:
where
and is the characteristic function of the sphere .
Remark 2.
Obviously
Definition 3.
Suppose , , and λ be a non-negative real number. Then the weighted Morrey-Herz space is defined as follows.
where
Remark 3.
It is evident that
For the analog of Herz-Morrey space on Euclidean space we refer the interested reader to the paper [38] by Lu and Xu. Recently, the study reported in [38] was extended to variable exponent Herz-Morrey spaces in [39,40].
Definition 4.
Suppose . The Lipschitz space is the space of all measurable functions f on such that:
Lemma 1.
([30]) Let E be an matrix with entries Then the norm of regarded as an operator from to is defined as:
Definition 5.
([26]) Let . The set consist of all measurable function on Satisfying:
- (a)
- a.e.,
- (b)
- (c)
- for all
It is not difficult to see that a weight needs not to be necessarily locally integrable function. Importantly, if then but if and only if
Lemma 2.
([27]) Let Then for any we have
Here and in the sequel, for the sake of easiness, we use the following notation:
where E is any invertible matrix, and is a non-zero positive real number.
It is easy to see that:
where
Proposition 1.
([29]) Let is any nonsingular matrix and then
Lemma 3.
([29]) Let and E is any nonsingular matrix, then we have
Now, we are in position to state our main results which are as under:
Main Results
Theorem 1.
Let , and then is bounded on and satisfies the following inequality
where
Our first result regarding boundedness of with can be stated as:
Theorem 2.
Let and Assume that and
Then the commutator operator is bounded from to and satisfies the inequality:
where
In the following theorem we proved the boundedness of commutator of Hausdorff operator on Morrey Herz Space by taking
Theorem 3.
Let , , and and Then the commutator operator is bounded from to and satisfies the inequality:
where
In the rest of the article, the character C denote the constant free from essential values and variables whose value may change from line to line.
3. Proofs of Main Results
3.1. Proof of Theorem 1
Suppose . By means of Fubini theorem and p-adic change of variables we have
Using Minkowski’s inequality, Proposition 1 and Lemma 3 with , we are down to
Thus, we completed the proof of Theorem 1.
3.2. Proof of Theorem 2
Let and
By Hölder’s inequality, p-adic change of variables and Proposition 1, we estimate I as below:
Similarly for first making p-adic change of variables and then applying Hölder’s inequality, we have
Since therefore, by virtue of the property (8) and Lemma 3, the above inequality becomes
The estimation of is very much similar to that of I and except that in this case, additionally, we have to bound the term Therefore, in this case, we will make use of the Hölder’s inequality, Lemma 2 and p-adic change of variables to have
Next, if then there exists an integer such that
Therefore,
A use of Hölder’s Inequality and the definition of yields
The other term can be treated in a similar way as below
Therefore, for
When a similar argument yields
Therefore,
Finally, we combine the estimates for I, and to have
In order to avoid repetition of the same factor in the subsequent calculations, we let
Also, it is easy to see that (see [29], Theorem 3.1)
Therefore,
Now, by the definition of Morrey-Herz space, the inequality (11), Minkowski’s inequality and the condition we have
Since , as a consequence
Hence,
Thus the proof of the Theorem 2 is completed.
3.3. Proof of Theorem 3
Let , . By applying the Minkowski’s inequality and the Holder’s inequality, we get
where . By the definition of Lipschitz space we have
for every and for almost everywhere .
By p-adic change of variables, Proposition 1, inequality (14) together with inequality (13) assumes the following form
Furthermore, in view of inequality (10) and we get
The factor repeats itself many times in the remaining proof of this theorem, so we let it be denoted by With this we break our proof in the following two cases:
Case 1: , in this case we first evaluate the inner norm as below:
Next, by virtue of Equation (12), the inequality (16) becomes
Therefore, by definition of Morrey-Herz space and we have
substituting back the value of we get the desired result.
Case 2: and .
4. Conclusions
Here we employed some conditions on the norm of matrix to ensure the boundedness of the commutators of Hausdorff operator on p-adic Herz-Morrey spaces. An idea that can be employed on various situations to obtain boundedness results for the p-adic matrix Hausdorff operator and its commutators on different function spaces.
Author Contributions
All authors read and approved the final manuscript.
Funding
This research received no external funding.
Acknowledgments
We would like to thank anonymous referees for their valuable suggestions and comments which help us to improve the earlier version of this manuscript. This research was supported by Higher Education Commission (HEC) NRPU Programme 2017-18.
Conflicts of Interest
The authors declare no conflict of interest.
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