EUROPEAN JOURNAL OF PURE AND APPLIED MATHEMATICS 2025, Vol. 18, Issue 4, Article Number 6519 ISSN 1307-5543 – ejpam.com Published by New York Business Global Boundedness of the Sublinear Operators on Anisotropic Herz-Slice Spaces Babar Sultan1, Amjad Hussain1,∗, Mehvish Sultan2, Ioan-Lucian Popa3,4,∗ 1 Department of Mathematics, Quaid-I-Azam University, Islamabad 45320, Pakistan 2 Department of Mathematics, Capital University of Science and Technology, Islamabad, Pakistan 3 Department of Computing, Mathematics and Electronics, “1 Decembrie 1918” University of Alba Iulia, 510009 Alba Iulia, Romania 4 Faculty of Mathematics and Computer Science, Transilvania University of Brasov, Iuliu Maniu Street 50, 500091 Brasov, Romania Abstract. We will define the idea of anisotropic Herz-slice spaces and prove some properties of these spaces. As an application we obtain the bounds for sublinear operator on anisotropic Herz-slice spaces. 2020 Mathematics Subject Classifications: 42B35, 47B38 Key Words and Phrases: Herz spaces, slice spaces, Herz-slice spaces, integral operators, atomic decomposition, boundedness 1. Introduction Let p ∈ (0,∞), the Lebesgue space is defined as Lp(E) := { f is measurable: Ip ( f γ ) < ∞ for some constant γ > 0 } where Ip(f) := ∫ E |g(x)|pdx and ‖f‖Lp(E) := inf { γ > 0 : Ip ( f γ ) 6 1 } . ∗Corresponding author. ∗Corresponding author. DOI: https://doi.org/10.29020/nybg.ejpam.v18i4.6519 Email addresses: babarsultan40@yahoo.com (B. Sultan), a.hussain@qau.edu.pk (A. Hussain), mehvishsultanbaz@gmail.com (M. Sultan), lucian.popa@uab.ro (I.-L. Popa) https://www.ejpam.com 1 Copyright: © 2025 The Author(s). (CC BY-NC 4.0) B. Sultan et al. / Eur. J. Pure Appl. Math, 18 (4) (2025), 6519 2 of 11 Afterward, Lp(E) is a Banach space, and ‖ · ‖Lp(E) is its norm. Slice spaces were initially presented in [1] to study weak solutions of boundary value problems for time-independent elliptic systems in the upper half-plane. This concept was later expanded upon in [2], where generalized slice spaces were used to study the mapping properties of sublinear operators on tent spaces, the Hardy-Littlewood maximal operator M , and the Calderón-Zygmund operators. Let u ∈ (0,∞), p ∈ [1,∞) and r ∈ (1,∞), the slice space (Ep r )u is defined as the set of all measurable functions g such that ‖f‖(Ep r ) u := ∥∥∥∥∥∥∥  1 |B(·, u)| ∫ B(·,u) |f(y)|r dy  ∥∥∥∥∥∥∥ Lp < ∞. More recently, great attention was paid to the study on the Herz spaces since there are several remarkable works to push forward the study on the Herz spaces. Conversely, Herz spaces, a class of function spaces, have been pivotal in real analysis due to their norms, which explicitly incorporate both local and global information of functions. For more results generalized versions of Herz space like boundedness of sublinear operators, fractional integrals, the commutator of singular integrals with BMO functions, and the commutator of fractional integrals with BMO functions see [3–25]. Let α ∈ R, q ∈ (0,∞], and 0 < p ≤ ∞, then the homogeneous version of Herz spaces K̇α,q p are defined by K̇α,q p = { g ∈ Lp loc(R n \ {0}) : ‖g‖K̇α,q p < ∞ } , where ‖g‖K̇α,q p = ( ∞∑ `=−∞ 2`αq‖gχ`‖qLp ) 1 q . Firstly, we define the idea of anisotropic Herz-slice spaces by using anisotropic Herz spaces and slice spaces. We will establish the atomic decomposition in these spaces. Then, we obtain boundedness for sublinear in these spaces. 2. Preliminaries Now we give some notations. Let l ∈ Z, define Bl := { z ∈ Rn : |z| 6 2l } , Rl := Bl\Bl−1, and χl := χRl . A n × n real matrix O is called dilation or expansive matrix if |γ| > 1, where γ is the eigenvalue. Let γ1, · · · , γn are eigenvalues of O such that 1 < |γ1| ≤ · · · ≤ |γn| and γ−, γ+ are two numbers such that 1 < γ− < |γ1| ≤ |γn| < γ+. Let | · | is the Euclidean norm, P is nondegenerate matrix of order n× n and r > 1, then the set ∆ ⊂ Rn is called ellipsoid if ∆ = {z ∈ Rn : |Pz| < 1}. consider an ellipsoid ∆ and r > 1, dilation O, ∆ ⊂ r∆ ⊂ A∆ and |∆| = 1, |∆| is the Lebesgue measure of ∆. If B` = O`∆ for ` ∈ Z, then we get B` ⊂ rB` ⊂ B`+1, and |B`| = b` such that b = ∏n i=1 |γi| = |detO| > 1. Assume that w is B. Sultan et al. / Eur. J. Pure Appl. Math, 18 (4) (2025), 6519 3 of 11 the smallest integer such that 2B0 ⊂ OwB0 = Bw. A quaisi-norm with expansive matrix O is a measurable mapping τO : Rn → [0,∞) such that τO(y) > 0 for y 6= 0 , τO(Ay) = |detA|τ(y) for y ∈ Rn , τO(x+ y) ≤ C (τO(x) + τO(y)) for x , y ∈ Rn , where C ≥ 1. The step homogeneous quasi-norm τ on Rn defined by dilation O is given as ( τ(x) = bj for x ∈ Bj+1 \ Bj ) and (0 for x = 0 ) . If x, y ∈ Rn, then we have τ(x+ y) ≤ bw (τ(x) + τ(y)) . (2.1) Definition 1. If α ∈ R, u ∈ (0,∞), p, q ∈ [1,∞) and r ∈ (1,∞), then the homogeneous version of anisotropic Herz-slice spaces ( K̇Eα,p q,r ) u (O;Rn) are defined by ( K̇Eα,p q,r ) u (O;Rn) = { g ∈ (Ep r )u : ‖g‖( K̇Eα,p q,r ) u (O;Rn) < ∞ } , where ‖g‖( K̇Eα,p q,r ) u (O;Rn) = ( ∞∑ `=−∞ b`αq‖gχ`‖q(Ep r ) u ) 1 q . Now we state the Hölder’s inequality for slice space. Lemma 2. [26] Let 1 ≤ p ≤ ∞, 0 < u < ∞ and 1 < r < ∞, ‖fg‖L1(Rn) ≤ ‖f‖(Ep r ) u ‖g‖( Ep′ r′ ) u where 1 p + 1 p′ = 1 r + 1 r′ = 1. Lemma 3. [27] Let u ∈ (0,∞), p, r ∈ (1,∞), if x0 ∈ Rn, and 1 < r0 < ∞, then the characteristic function on B (x0, r0) fulfills∥∥χB(x0,r0) ∥∥( Ep r ) u ≤ Cr n/p 0 . Remark 4. [27] Let u ∈ (0,∞), p.r ∈ (1,∞), ` ∈ Z, then the characteristic function on R` fulfills ‖χR` ‖(Ep r ) u ≤ ‖χB` ‖ ( Ep r ) u ) ≤ Cb`n/p. B. Sultan et al. / Eur. J. Pure Appl. Math, 18 (4) (2025), 6519 4 of 11 3. Atomic Decomposition of anisotropic Herz-slice spaces Definition 5. Let α ∈ R, and p, q, r, u ∈ (0,∞]. Then (i) A measurable function a(y) is called central (α, p, r, u)-block if supp a ⊂ Bl and ‖a‖(Ep r ) u ≤ b−lα. (ii) A measurable function a(y) is called central (α, p, r, u)-block if supp a ⊂ Bl. Theorem 3.1. Let α ∈ R, and p, q, r, u ∈ (0,∞]. Let b` be a central (α, p, r, u)-block with support d in B` and ∑∞ `=−∞ |γ`|q < ∞. Then the following two statements are equivalent: (i) g ∈ ( K̇Eα,p q,r ) u (O;Rn). (ii) g are given as g(y) = ∞∑ `=−∞ γ`b`(y). (2.1) Proof. We first prove (i) implies (ii). For every g ∈ ( K̇Eα,p q,r ) u (O;Rn), write g(y) = ∞∑ `=−∞ g(y)χ`(y) = ∞∑ `=−∞ b`α ‖gχ`‖(Ep r ) u g(y)χ`(y) b`α ‖χ`‖(Ep r ) u = ∞∑ `=−∞ γ`b`(x), where γ` = b`α ‖gχ`‖(Ep r ) u and b`(x) = g(y)χ`(y) b`α‖χ`‖(Ep r ) u . It is easy to note that supp b` ⊂ B` and ‖b`‖(Ep r ) u = |B`|−α/n. So every b` is a central (α, p, r, u)-block with support contained in B` ∞∑ `=−∞ |γ`|q = ∞∑ `=−∞ b`α ‖gχ`‖q(Ep r ) u = ‖g‖q( K̇Eα,p q,r ) u (O;Rn) < ∞. Now we prove (ii) implies (i). Let g(y) = ∑∞ `=−∞ γ`b`(y), we get ‖gχj‖(Ep r ) u ≤ ∞∑ `=j |γ`| ‖b`‖(Ep r ) u . (3.1) If 0 < q ≤ 1. From (3.1) it follows that ‖g‖q( K̇Eα,p q,r ) u (O;Rn) = ∞∑ `=−∞ b`α ‖gχ`‖q(Ep r ) u B. Sultan et al. / Eur. J. Pure Appl. Math, 18 (4) (2025), 6519 5 of 11 ≤ ∞∑ `=−∞ b`αq ‖gχ`‖q(Ep r ) u ≤ ∞∑ `=−∞ b`αq  ∞∑ j=` |γj |q ‖bj‖q(Ep r ) u  . Let I = ∞∑ `=−∞ b`αq (∑∞ j=` |γj | q ‖bj‖q(Ep r ) u ) . By using the fact 0 < α < ∞, we get I = ∞∑ `=−∞ b`αq  ∞∑ j=` |γj |q ‖bj‖q(Ep r ) u  . ∞∑ `=−∞ b`αq ∞∑ j=` |γj |q b−jαq . ∞∑ `=−∞ ∞∑ j=` |γj |q b(`−j)αq . ∞∑ j=−∞ j∑ `=−∞ |γj |q b(`−j)αq . ∞∑ j=−∞ |γj |q . If 1 < q < ∞, we have For I, if 0 < α < ∞, then (3.1) and Hölder’s inequality yields I . ∞∑ `=−∞ b`αq  ∞∑ j=` |γj | ‖bj‖(Ep r ) u  . ∞∑ `=−∞  ∞∑ j=` |γj | b(`−j)α q . ∞∑ `=−∞  ∞∑ j=` |γj |q b(`−j)αq/2  ∞∑ j=` b(`−j)αq′/2 q/q′ . ∞∑ `=−∞  ∞∑ j=` |γj |q b(`−j)αq/2  . ∞∑ j=−∞ j∑ `=−∞ |γj |q b(`−j)αq/2 B. Sultan et al. / Eur. J. Pure Appl. Math, 18 (4) (2025), 6519 6 of 11 . ∞∑ j=−∞ |γj |q . Thus the proof of the Theorem is completed. Non-homogeneous version of the Theorem is obtained similarly. Remark 6. By using the Theorem, note that if g ∈ ( K̇Eα,p q,r ) u (O;Rn) and g(y) =∑∞ `=−∞ γ`b`(x) is a central (α, p, r, u)-block decomposition, then ‖g‖( K̇Eα,p q,r ) u (O;Rn) ≈ ( ∞∑ `=−∞ |γ`|q )1/q . 4. Boundedness of sublinear operators on anisotropic Herz-slice spaces As applications of the decomposition theorem, we will prove the boundedness of sub- linear operators on anisotropic Herz-slice spaces. Theorem 4.1. Let α ∈ R, with 0 < α < 1/p′ and p, q, r, u ∈ (0,∞]. Let the sublinear T fulfills the size condition |Tg(y)| . ∫ Rn |g(y)| τ(x− y) dy, x /∈ supp g, (4.1) for any g ∈ (Ep r )u with a compact support and T is bounded on (Ep r )u. Then T is bounded in ( K̇Eα,p q,r ) u (O;Rn). Proof. Let g ∈ ( K̇Eα,p q,r ) u (O;Rn)/ such that g(y) = ∑∞ a0=−∞ γa0ba0(x) where ba0 is a central (α, p.r, u)-block with support contained in Ba0 , By applying the decomposition theorem, we get ‖g‖( K̇Eα,p q,r ) u (O;Rn) ≈ ( ∞∑ a0=−∞ |γa0 | q )1/q . Therefore, we get ‖Tg‖q( K̇Eα,p q,r ) u (O;Rn) = ∞∑ `=−∞ b`αq ‖(Tg)χ`‖q(Ep r ) u . ∞∑ `=−∞ b`αq ‖(Tg)χ`‖q(Ep r ) u . ∞∑ `=−∞ b`αq ( `−w−1∑ a0=−∞ |γa0 | ‖(Tba0)χ`‖(Ep r ) u )q B. Sultan et al. / Eur. J. Pure Appl. Math, 18 (4) (2025), 6519 7 of 11 + ∞∑ `=−∞ b`αq  ∞∑ a0=`−w |γa0 | ‖(Tba0)χ`‖(Ep r ) u q = I1 + I2. To find the estimate of I1. Let x ∈ C`, y ∈ Ba0 such that a0 ≤ ` − w − 1,, then (2.1) yields b−w(1− 1/b)τ(x) = b−wτ(x)− b−w−1τ(x) ≤ b−wτ(x)− τ(y) ≤ τ(x− y). Hence (4.1) and Hölder’s inequality yields |Tba0(x)| ≤ Cτ(x)−1 ∫ Ba0 |ba0(y)| dy ≤ Cb−` ‖ba0‖(Ep r ) u ∥∥χBa0 ∥∥( Ep′ r′ ) u . Applying Lemmas 2 and 4, we get ‖(Tba0)χ`‖(Ep r ) u . b−` ‖ba0‖(Ep r ) u ∥∥χBa0 ∥∥( Ep′ r′ ) u ‖χB` ‖(Ep r ) u . b−` ‖ba0‖(Ep r ) u ( |B`| ‖χB` ‖−1( Ep′ r′ ) u )∥∥χBa0 ∥∥( Ep′ r′ ) u . ‖ba0‖(Ep r ) u ∥∥χBa0 ∥∥( Ep′ r′ ) u ‖χB` ‖( Ep′ r′ ) u . b(a0−`)/p′ ‖ba0‖(Ep r ) u . Therefore, for 0 < q ≤ 1, and 0 < α < 1/p′, we have I1 = ∞∑ `=−∞ b`αq ( `−w−1∑ a0=−∞ |γa0 | ‖(Tba0)χ`‖(Ep r ) u )q . ∞∑ `=−∞ b`αq ( `−w−1∑ a0=−∞ |γa0 | q b[(a0−`)/p′−a0α]q ) . −w−2∑ a0=−∞ |γa0 | q ∞∑ `=a0+w+1 b(a0−`)[1/p′−α]q . −w−2∑ a0=−∞ |γa0 | q B. Sultan et al. / Eur. J. Pure Appl. Math, 18 (4) (2025), 6519 8 of 11 . ‖g‖q( K̇Eα,p q,r ) u (O;Rn) . When 1 < q < ∞, 0 < α < 1/p′, and the Hölder inequality yields I1 . ∞∑ `=−∞ b`αq ( `−w−1∑ a0=−∞ |γa0 | b(a0−`)/p′−a0α )q . ∞∑ `=−∞ ( `−w−1∑ a0=−∞ |γa0 | q b(a0−`)[1/p′−α]q/2 )( `−w−1∑ a0=−∞ b(a0−`)[1/p′−α]q′/2 )q/q′ . ∞∑ `=−∞ ( `−w−1∑ a0=−∞ |γa0 | q b(a0−`)[1/p′−α]q/2 ) . −w−2∑ a0=−∞ |γa0 | q −1∑ `=a0+w+1 b(a0−`)[1/p′−α]q/2 . −w−2∑ a0=−∞ |γa0 | q . ‖g‖q( K̇Eα,p q,r ) u (O;Rn) . Next we find the estimate of I2. If 0 < q ≤ 1, by (Ep r )u boundedness of T , we get I2 = ∞∑ `=−∞ b`αq  ∞∑ a0=`−w |γa0 | ‖(Tba0)χ`‖(Ep r ) u q . ∞∑ `=−∞ b`αq  ∞∑ a0=`−w |γa0 | q ‖ ba0 | q( Ep r ) u  . ∞∑ `=−∞ b`αq  ∞∑ a0=`−w |γa0 | q b−a0αq  . ∞∑ `=−∞ ∞∑ a0=`−w |γa0 | q b(`−a0)αq . ∞∑ a0=−∞ |γa0 | q a0+w∑ `=−∞ b(`−a0)αq . ∞∑ a0=−∞ |γa0 | q . ‖g‖q( K̇Eα,p q,r ) u (O;Rn) . B. Sultan et al. / Eur. J. Pure Appl. Math, 18 (4) (2025), 6519 9 of 11 If 1 < q < ∞, by using (Ep r )u boundedness of T and again Hölder inequality to obtain I2 . ∞∑ `=−∞ b`αq  ∞∑ a0=`−w |γa0 | ‖ba0‖(Ep r ) u q . ∞∑ `=−∞  ∞∑ a0=`−w |γa0 | b(`−a0)α q . ∞∑ `=−∞  ∞∑ a0=`−w |γa0 | q b(`−a0)αq/2  ∞∑ a0=`−w b(`−a0)α(q) ′/2 q/q′ . ∞∑ a0=−∞ |γa0 | q a0+w∑ `=−∞ b(`−a0)αq/2 . ∞∑ a0=−∞ |γa0 | q . ‖g‖q( K̇Eα,p q,r ) u (O;Rn) . Combining these estimates we get ‖Tg‖( K̇Eα,p q,r ) u (O;Rn) . ‖g‖( K̇Eα,p q,r ) u (O;Rn) . Thus, the proof of the Theorem 4.1 is completed. 5. Ethics declarations Conflict of interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper. Ethics approval and consent to participate This manuscript has not and will not be submitted to more than one journal for simultaneous consideration. The submitted work is original and will not be published elsewhere. 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Herz-slice spaces and applications, 2022. arXiv:2204.08635. Introduction Preliminaries Atomic Decomposition of anisotropic Herz-slice spaces Boundedness of sublinear operators on anisotropic Herz-slice spaces Ethics declarations