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Numerical simulation and analysis of fractional-order Phi-Four equation

  • This paper introduces a novel numerical approach for tackling the nonlinear fractional Phi-four equation by employing the Homotopy perturbation method (HPM) and the Adomian decomposition method (ADM), augmented by the Shehu transform. These established techniques are adept at addressing nonlinear differential equations. The equation's complexity is reduced by applying the Shehu Transform, rendering it amenable to solutions via HPM and ADM. The efficacy of this approach is underscored by conclusive results, attesting to its proficiency in solving the equation. With extensive ramifications spanning physics and engineering domains like fluid dynamics, heat transfer, and mechanics, the proposed method emerges as a precise and efficient tool for resolving nonlinear fractional differential equations pervasive in scientific and engineering contexts. Its potential extends to analogous equations, warranting further investigation to unravel its complete capabilities.

    Citation: Azzh Saad Alshehry, Humaira Yasmin, Rasool Shah, Roman Ullah, Asfandyar Khan. Numerical simulation and analysis of fractional-order Phi-Four equation[J]. AIMS Mathematics, 2023, 8(11): 27175-27199. doi: 10.3934/math.20231390

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  • This paper introduces a novel numerical approach for tackling the nonlinear fractional Phi-four equation by employing the Homotopy perturbation method (HPM) and the Adomian decomposition method (ADM), augmented by the Shehu transform. These established techniques are adept at addressing nonlinear differential equations. The equation's complexity is reduced by applying the Shehu Transform, rendering it amenable to solutions via HPM and ADM. The efficacy of this approach is underscored by conclusive results, attesting to its proficiency in solving the equation. With extensive ramifications spanning physics and engineering domains like fluid dynamics, heat transfer, and mechanics, the proposed method emerges as a precise and efficient tool for resolving nonlinear fractional differential equations pervasive in scientific and engineering contexts. Its potential extends to analogous equations, warranting further investigation to unravel its complete capabilities.



    One of the concepts which have significant impact in Clifford analysis is studying the approximation of a Cliffordian function h(m)(x), xRm+1 as a series of the form:

    n=0Q(m)n(x) a(m)n,  a(m)nCm, (1.1)

    where {Q(m)n(x), xRm+1} is a prescribed base of Cllifordian polynomials and Cm is the real Clifford algebra of dimension 2m. In 1990, this problem was addressed by the authors of [1]. The polynomials are assumed to form a Hamel basis of Sm(x) (the Clifford linear space of all special monogenic polynomials (SMPs) with Clifford algebra coefficients). The series (1.1) is called the basic series associated with the base of SMPs. Many results about the approximation of SMFs and ESMFs by basic series, which can be associated with bases of SMPs [2,3].

    The theory of basic series in the case of one complex variable was originally discovered by Whittaker and Cannon [4,5,6,7] about 90 years ago. As we have mentioned earlier, the attempt done by authors of [1] were the first to extend the notion of basic series in the case of Clifford analysis.

    In the case of a single complex variable, the approximation properties of the derivative and integral bases of a certain base of polynomials of in a disk of center origin have been studied by many authors, of whom we may mention Makar [8], Mikhail [9], and Newns [10]. In the case of of several complex variables the domains of representation are hyperspherical, hyperelliptical and polycylinderical regions (see [11,12]). Afterwards, the authors of [13,14] generalized this problem in Clifford analysis, which is called hypercomplex primitive and derivative bases of SMPs and their representations is in closed hyperballs.

    Approximation theory is a rich topic which has numerous applications in various scientific disciplines such that mathematical analysis, statistics, engineering and physics. Recently, order moment of the wind power time series has been studied in [15]. Although our study is narrowed to theoretical aspects, the basic sets (bases) of polynomials proved its efficiency in as solutions to important partial differential equations, such as the heat equation [16] and wave equation [17,18].

    The authors of [19] introduced an expansion of a SMF by basic series of generalized Bessel SMPs. They proved that the GBSMPs are solutions of second order homogeneous differential equations. Furthermore, in [3], the authors proved an extended version of Hadamard's three-hyperballs theorem to study the overconvergence properties. One of the recent fascinating research findings can be found in [20] where the authors of used the Hadamard's three-hyperballs theorem to generalize the Whittaker-Cannon theorem in open hyperballs in Rm+1. Precisely, they proved that the hypercomplex Cannon functions preserved the effectiveness properties of both Cannon and non-Cannon bases. In the very recent paper [21] the authors derived a new base of SMPs in F-modules, named the equivalent base. They have also studied the convergence properties (effectiveness, order and type, Tρ-property) of these base.

    In 2017, a study based primarily on combination of Clifford analysis and functional analysis [26] when the considered bases {Q(m)n(x)} are not necessarily consisting of polynomials. The convergence properties of these general bases had been studied in F-modules. Precisely, a general criterion for effectiveness of basic series in F-modules was constructed.

    Recently in [22], the authors have studied a new base called hypercomplex Ruscheweyh derivative bases (HRDBs). They investigated the effectiveness properties of HRDBs of a given base of SMPs in different regions of convergence in F-modules. The above treatment is considered to extend and improve the results in Clifford and complex given in [8,9,10,13,14].

    Motivated by the preceding discussion, the current work introduces a modified generalization of the Hasse derivative operator (HDO). Acting by hypercomplex HDO on bases, we derive a base of SMPs, which we may call the hypercomplex Hasse derivative bases of SMPs (HHDBSMPs). Consequently, we discuss the effectiveness properties, mode of increase, and the Tρ-property of such a base in several regions: closed and open hyperballs, open regions surrounding closed hyperball, at the origin, and for all entire SMFs. Some applications on the HHD of Bernoulli SMPs (BSMPs), Euler SMPs (ESMPs), proper Bessel SMPs (PBSMPs), general Bessel SMPs (GBSMPs) and Chebyshev SMPs (CSMPs) are also provided. The obtained results offer new generalizations of existing work concerning the convergence properties of polynomials bases in both complex and Clifford settings.

    This section collects some notations and basic results which are needed throughout the paper. More details can be found in the literature, see [1,23,24,25,26]. The real Clifford algebra over R is defined as

    Cm={b=B{1,...m} bBeB, bBR},

    where ei=e{i}, i=1,,m, e0=eϕ=1 and eB=eβ1...eβh, with 1β1<β2<<βhm. The product in Cm is determined by the relations eiej+ejei=2δij where δij denotes the Kronecker delta and e0=1 for 1ijm (for details on the main concepts about Cm, see [25]). The norm of a Clifford number is given by |b|=(BN|bB|2)12 where N stands for {1,,m}.

    Since Cm is isomorphic to R2m we may provide it with the R2m-norm |b| and one sees easily that for any b,cCm, |bc|2m2 |b||c|.

    The elements (x0,x)=(x0,x1,...,xm)Rm+1 will be identified with the Clifford numbers x0+x_=x0+mj=1ejxj. Note that if x=x0+x_Rm+1, ¯x=x0x_.

    Definition 2.1. Let xRm+1 and ΩRm+1 be an open set, then the function h(m)(x) is called left monogenic in Ω if D[h(m)(x)]=0 where

    D=mi=0eixi

    is the generalized Cauchy-Riemann operator. Similarly, h(m)(x) is a right monogenic function if [h(m)(x)]D=0.

    Definition 2.2. A polynomial Q(m)(x) is SMP iff DQ(m)(x)=0 and has the form:

    Q(m)(x)=finitei,j¯xixja(m)i,j,

    where a(m)i,jCm.

    Let Sm[x] be the space of all SMPs is the right Cm-module defined by

    Sm[x]=spanCm{Q(m)n(x): nN},

    where Q(m)n(x) was given in [1] as follows:

    Q(m)n(x)=n!(m)nr+s=n(m12)r(m+12)sr!s!¯xrxs, (2.1)

    where for βR, (β)l=β(β+1)(β+l1) is the Pochhamer symbol.

    Definition 2.3. Let ΩRm+1 be a connected open containing 0 and h(m) is monogenic in Ω. The function h(m) is said to be SMF in Ω if and only if its Taylor series near zero exists and cab be expressed as: h(m)(x)=n=0Q(m)n(x) a(m)n for some SMPs Q(m)n(x).

    If Q(m)n(x) is a homogeneous SMP has degree n in x, (see [1])

    Q(m)n(x)=Q(m)n(x) β(m)n,

    where β(m)nCm is a constant. Accordingly, it follows that:

    Q(m)nR=sup¯B(R)|Q(m)n(x)|=Rn.

    Next, we recall the definition of F-module.

    Definition 2.4. An F-module E over Cm is a complete Hausdorff topological vector space by countable family of a proper system of semi-norms Q={.s}s0 such that s<th(m)sh(m)t; (h(m)E), Hence WE is open iff h(m)W, ϵ>0, M0 such that {g(m)E:h(m)g(m)s)ϵ}W,sM.

    Definition 2.5. A sequence {h(m)n} in an F-module E converges to g(m) in E if

    limn h(m)ng(m)s=0

    for all .sQ.

    The domains of representation adopted here are the open hyperball B(R), the closed hyperball ¯B(R) and B+(R); R>0, where B+(R) any open hyperball enclosing closed hyperball, these are the sets defined by

    B(R)={xRm+1:|x|<R},
    ¯B(R)={xRm+1:|x|R},
    B+(R)={xRm+1:|x|<R+}.

    Table 1 summarizes certain classes of SMFs which represent F-modules where xRm+1 and each space is associated with the a proper countable system of semi-norms as follows.

    Table 1.  F-modules.
    Space The Associated Semi-Norms
    M[B(R)]: Class of SMFs in B(R) h(m)r=sup¯B(r)|h(m)(x)|,  r<R, h(m)M[B(R)],
    M[¯B(R)]: Classe of SMFs in ¯B(R) h(m)R=sup¯B(R)|h(m)(x)|,   h(m)M[¯B(R)],
    M[B+(R)]: Class of SMFs in B+(R) h(m)r=sup¯B(r)|h(m)(x)|,  R<r, h(m)M[B+(R)],
    M[0+]: Class of SMFs at the origin h(m)ϵ=sup¯B(ϵ)|h(m)(x)|, ϵ>0  h(m)M[0+] ,
    M[]: Class of ESMFs on Rm+1 h(m)n=sup¯B(n)|h(m)(x)|, n<  h(m)M[].

     | Show Table
    DownLoad: CSV

    Now, let {Q(m)n(x)} be a base of an F-module E such that

    Q(m)n(x)=k=0Q(m)k(x) Q(m)n,k,  Q(m)n,kCm, (2.2)
    Q(m)n(x)=k=0 Q(m)k(x) π(m)n,k,  π(m)n,kCm, (2.3)
    Q(m)nR=sup¯B(R)|Q(m)n(x)|, (2.4)
    ΨQ(m)n(R)=kQ(m)k π(m)n,kR, (2.5)

    this sum is called hypercomplex Cannon sum, where

    Q(m)k π(m)n,kR=sup¯B(R)|Q(m)k(x) π(m)n,k|,ΨQ(m)(R)=lim supn{ΨQ(m)n(R)}1n, (2.6)

    where ΨQ(m)(R) is called the hypercomplex Cannon function of the base {Q(m)n(x)} in closed hyperball ¯B(R).

    Let Dn is the degree of the polynomial of highest degree in the representation (2.3) the following restrictions are imposed.

    limn{Dn}1n=1, (2.7)
    Dn=O[na],  a1,  (2.8)
    Dn=o(nlogn). (2.9)

    If dk is the degree of the polynomials {Q(m)k(x)}, then dkDn for all kn (see [1]).

    If Q(m)=(Q(m)n,k) and Π(m)=(π(m)n,k) are the Clifford matrices of coefficients and operators respectively of the set {Q(m)n(x)}. Thus according to [1] the set {Q(m)n(x)} will be base iff

    Q(m)Π(m)=Π(m)Q(m)=I, (2.10)

    where I is the unit matrix.

    Let h(m)(x)=n=0Q(m)n(x) an(h(m)) be any function which is SMF at the origin, substituting for Q(m)n(x) from (2.3) we obtain the basic series

    h(m)(x)n=0Q(m)n(x) Πn(h(m)), (2.11)

    where

    Πn(h(m))=k=0π(m)k,n ak(h(m)) . (2.12)

    The authors in [22,26] introduced the idea of effectiveness for the class M[¯B(R)]. A base {Q(m)n(x)} is effective for the class M[¯B(R)] If the basic series (2.11) converges normally to every function h(m)(x)M[¯B(R)] which is SMF in ¯B(R). Similar definitions are used for the classes M[B(R)], M[B+(R)], M[] and M[0+].

    They also proved:

    Theorem 2.1. A base {Q(m)n(x)} is effective for the classes M[¯B(R)], M[B(R)], M[B+(R)], M[] or M[0+] if and only if ΨQ(m)(R)=R, ΨQ(m)(r)<R   r<R, ΨQ(m)(R+)=R, ΨQ(m)(R)<  R<, or ΨQ(m)(0+)=0.

    For the definition of bases of SMPs and theorems governing the effectiveness properties of bases of SMPs, the reader is referred to the authors [21,22,26].

    The complex Hasse derivative operator (CHDO) of order i is defined in [28,29,30]. Using the definition of the complex Hasse derivative, we can define a new operator in the case of Clifford setting called the hypercomplex Hasse derivative (HHD) as follows:

    Definition 3.1. For each integer i0 the HHD H(i) of order i is defined by

    H(i)(Q(m)n(x))=ζn,i Q(m)ni(x), (3.1)

    where

    ζn,i=nii!i1j=1(1jn)

    and H(i) is closely related to the higher hypercomplex derivative (12¯D)i: H(i)=1i!(12¯D)i.

    The set {Q(m)n(x)} is an Appell sequence with respect to x0 or 12¯D : 12¯DQ(m)n(x)=nQ(m)n1(x).

    Remark 3.1. If xC1 then (3.1) is reduced to the ordinary Hasse derivative of order i (see [28,29,30]),

    Definition 3.2. Let {Q(m)n(x)} be a base. By acting on both sides of Eq (2.2) with the operator H(i), we get

    H(i)Q(m)n(x)=k  ζk,i Q(m)ki(x)Q(m)n,k. (3.2)

    The set {H(i)Q(m)n(x)} = {H(i,m)(x)} is defined the Hypercomplex Hasse derivative bases (HHDBs).

    The present work deals principally with the convergence properties of certain classes of bases, namely HHDBs. In fact we shall study the convergence of the expansion of certain classes of functions as series of HHDBs. This study will be based on the already established theorems dealing with the convergence of basic series of HHDBs. The convergence properties of HHDBs are mainly classified as follows:

    (1) The region of effectiveness of HHDBs for the classes M[B(R)], M[¯B(R)], M[B+(R)], M[0+], and M[].

    (2) The mode of increase of HHDBs which determined by the order and type.

    (3) The Tρ-property of HHDBs.

    In the following sections, we will investigated all of these problems.

    In the current section, the property of effectiveness concerning the HHDBs in several regions such as M[B(R)], M[0+], M[] and M[B+(R)] are demonstrated.

    Theorem 4.1. If {Q(m)n(x)} is a base, then the HHD set {H(i,m)(x)} is also base.

    Proof. We form the coefficient matrix H(i,m) by defining the HHDBs in (2.2)

    H(i,m)n(x)=k Q(m)ki(x) ζk,iQ(m)n,k.

    Hence, the coefficients matrix H(i,m) is given by the following:

    H(i,m)=(H(i,m)n,k)=(ζk,i Q(m)n,k).

    Also, the operators matrix Π(i,m) follows from the effect H(i) on both sides of the representation (2.3) where

    Q(m)ki(x)=1ζn,ikπ(m)n,kH(i,m)k(x),

    and

    Π(i,m)=(π(i,m)n,k)=(1ζn,i π(m)n,k).

    Consequently,

    H(i,m)Π(i,m)=(kH(i,m)n,kπ(i,m)k,h)=(kQ(m)n,kπ(m)k,h)=(δn,h)=I.

    Moreover,

    Π(i,m)H(i,m)=(kπ(i,m)n,kH(i,m)k,h)=(k1ζn,iπ(m)n,k ζh,i Q(m)k,h)=(ζh,iζn,iδn,h)=I.

    We easily obtain from (2.10) that the set {H(i,m)n(x)} is a base.

    Theorem 4.2. The base {Q(m)n(x)} and its HHDBs {H(i,m)n(x)} have the same region of effectiveness for the class M[B(R)].

    Proof. If Q(m)n(x) is a base, Q(m)nr=sup¯B(r)|Q(m)n(x)| and H(i,m)nr=sup¯B(r)|H(i,m)n(x)|, then

    H(i,m)nr=sup¯B(r)|H(i,m)n(x)|=sup¯B(r)|jζj,i Q(m)ji(x)Qn,j|2m/2jζj,i rjiQ(m)nRRj=2m/2riΥ(r,R) Q(m)nR=K1 Q(m)nR    for all r<R, (4.1)

    where K1=2m/2riΥ(r,R) and Υ(r,R)=j=0ζj,i(rR)j<.

    Using (2.5) and (4.1), it follows that the hypercomplex Cannon sum of the HHDBs {H(i,m)n(x)} is given by

    ΨH(i,m)n(r)=kH(i,m)kπ(i,m)n,krK1kQ(m)k π(i,m)n,kR=K1ζn,ikQ(m)kπ(m)n,kR=K1ζn,iΨQ(m)n(R). (4.2)

    Using (2.6) and (4.2), we obtain that the hypercomplex Cannon function of the HHDBs is given by:

    ΨH(i,m)(r)ΨQ(m)(R),   r<R. (4.3)

    Now, suppose that the base {Q(m)n(x)} is effective for M[B(R)], we can apply Theorem 2.1, we have

    ΨQ(m)(r)<R,   r<R. (4.4)

    Hence there is a number r1 such that r<r1<R, then from (4.3) and (4.4), we deduce that

    ΨH(i,m)(r)ΨQ(m)(r1)<R,   r<R,

    that is to say the base {H(i,m)n(x)} is effective for M[B(R)].

    Theorem 4.3. The base {Q(m)n(x)} and its HHDBs {H(i,m)n(x)} have the same region of effectiveness for the class M[0+] or M[].

    Proof. Suppose that the base {Q(m)n(x)} is effective for M[0+], we can apply Theorem 2.1, it follows that ΨQ(m)(0+)=0. Making R,r0+ in (4.3), we have ΨH(i,m)(0+)ΨQ(m)(0+)=0 but we know that ΨH(i,m)(0+)0, thus, ΨH(i,m)(0+)=0. Therefore, the base {H(i,m)n(x)} is effective for M[0+].

    Now, suppose that the base {Q(m)n(x)} is effective for M[]. Applying Theorem 2.1 we conclude that

    ΨQ(m)(r)<, r<. (4.5)

    Thus if we choose the number r2 such that r<r2<R, making R in (4.3). Then, by using (4.5), we obtain that

    ΨH(i,m)(r)ΨQ(m)(r2)<, r<,

    and, the base {H(i,m)n(x)} will be effective for M[].

    Theorem 4.4. The base {Q(m)n(x)} and its HHDBs {H(i,m)n(x)} have the same region of effectiveness for the class M[B+(R)].

    Proof. If the base {Q(m)n(x)} is effective for M[B+(r3)] and r3 is any positive number such that r3<r, we can apply Theorem 2.1, we obtain

    ΨQ(m)(r+3)=r3,  r3<r<R. (4.6)

    Making Rr+3 in (4.3), we easily obtain, from (4.6) that ΨH(i,m)(r+3)ΨQ(m)(r+3)=r3, but ΨH(i,m)(r+3)r3 which implies that ΨH(i,m)(r+3)=r3. Hence, the base {H(i,m)n(x)} is indeed effective for M[B+(r3)] as required.

    When the representation (2.3) is finite then the base is called SMPs. In this section we will discuss the region of effectiveness of HHDBSMPs for the class of SMFs in ¯B(R). The following result states the purpose of this section.

    Theorem 5.1. The base {Q(m)n(x)} for which the condition (2.7) is satisfied and its HHDBSMPs {H(i,m)n(x)} have the same region of effectiveness for the class M[¯B(R)].

    Proof. If Q(m)n(x) is a base of SMPs, Q(m)nR=sup¯B(R)|Q(m)n(x)| and H(i,m)nR=sup¯B(R)|H(i,m)n(x)|, then

    H(i,m)nR=sup¯B(R)|H(i,m)n(x)|=sup¯B(R)|jQ(m)n,j ζj,i Q(m)ji(x)|jQ(m)nRRj ζj,i Rji=Q(m)nRRij ζj,iQ(m)nRRi ζdn,i (ζdn,i+1), (5.1)

    where dn is the degree of the polynomial Q(m)n(x), dnDn. Applying (2.5) and (5.1), it follows that

    ΨH(i,m)n(R)=k H(i,m)k π(i,m)n,kR1ζn,iRikQ(m)k π(m)n,kR ζdk,i (ζdk,i+1)1ζn,iRiζDn,i (ζDn,i+1) ΨQ(m)n(R). (5.2)

    A combination of (2.6), (2.7) and (5.2), gives ΨH(i,m)n(R)ΨP(m)(R)R.

    But ΨH(i,m)n(R)R. We finally deduce that

    ΨH(i,m)n(R)=R. (5.3)

    and the HHDBSMPs {H(i,m)n(x)} is effective for M[¯B(R)].

    The following example shows that the condition (2.7) imposed on the class of the base {Q(m)n(x)} cannot be relaxed.

    Example 5.1. Theorem 5.1 is not always correct if the condition (2.7) is not satisfied. Let

    Q(m)n(x)={Q(m)n(x),n is even,Q(m)n(x)+ Q(m)b(x), b=2n,n is odd.

    When n is even, we have Q(m)n(x)=Q(m)n(x) and hence ΨQ(m)n(R)=Rn. Thus, by taking R=1, then ΨQ(m)n(1)=1, and limn{ΨQ(m)2n(1)}12n=1.

    Furthermore, Q(m)n(x)=Q(m)n(x)Q(m)b(x), when n is odd, then

    ΨQ(m)n(R)=Rn+2 Rb.

    So that when R=1, ΨQ(m)n(1)=3, we get

    limn {ΨQ(m)2n+1(1)}12n+1=1.

    Consequently, ΨQ(m)(1)=lim supn {ΨQ(m)n(1)}1n=1, and the base {Q(m)n(x)} is effective for M[¯B(1)].

    Forming the HHDBSMPs {H(i,m)n(x)}, we easily get

    H(i,m)n(x)={ζn,i Q(m)ni(x),n is even, and 2,ζn,i Q(m)ni(x)+ζb,iQ(m)bi(x), n is odd.

    Since Q(m)ni(x)=(1ζn,i) H(i,m)n(x), when n is even, then ΨH(i,m)n(R)=Rni, taking R=1, ΨH(i,m)n(1)=1. Hence,

    limn {ΨH(i,m)2n(1)}12n=1.

    When n is odd, Q(m)ni(x)=(1ζn,i)[H(i,m)Pn(x)ζb,iH(i,m)b(x)]. Hence we have, ΨH(i,m)n(R)=(1ζn,i)[ζn,iRni+2 ζb,iRbi].

    Taking R=1, then we get

    ΨH(i,m)(1)=lim supn {ΨH(i,m)2n+1(1)}12n+1=2>1,

    and the HHDBSMPs {H(i,m)n(x)} is not effective for M[¯B(1)].

    For a simple base of SMPs (Dn=n) (see [1]), we obtain the following corollary.

    Corollary 5.1. When the simple base {Q(m)n(x)} of SMPs is effective for M[¯B(R)], so also will be the HHDBSMPs {H(i,m)n(x)}.

    In [1,23], the idea of the order and type of the base {Q(m)n(x} of SMPs was introduced as follows:

    ρQ(m)=limRlim supnlog ΨQ(m)n(R)n log n. (6.1)

    and

    τQ(m)=limReρQ(m)lim supn{ΨQ(m)n(R)}1n ρQ(m)n. (6.2)

    Importantly, if the base {Q(m)n(x)} has finite order ρQ(m) and finite type τQ(m), then it can represent every ESMF of order less than 1ρQ(m) and type less than 1τQ(m) in any finite hyperball. Rich investigation on the order of certain classes of bases can be found in [31,32].

    Now, we explore the relation between the order and type of SMPs {Q(m)n(x)} and our constructed base; {H(i,m)n(x)} as follows.

    Theorem 6.1. Let ρQ(m) and τQ(m) be the order and type of the base of SMPs {Q(m)n(x)} satisfying the condition (2.8). Then the HHDBSMPs {H(i,m)n(x)} will be of order ρH(i,m)ρQ(m) and type τH(i,m)τQ(m) whenever ρH(i,m)=ρQ(m). The values of ρQ(m) and τQ(m) are attainable.

    Proof. The proof of this theorem denoted on the inequality (5.2), since

    ΨH(i,m)n(R)1ζn,iRαζDn,i (ζDn,i+1) ΨQ(m)n(R).

    Then

    limRlim supnlog ΨH(i,m)n(R)n log nlimRlim supnlog ζDn,i (ζDn,i+1)+log ΨQ(m)n(R)n log n.

    It follows, in view of (6.1), that the HHDBSMPs is at most ρQ(m).

    If ρH(i,m)=ρQ(m), we have

    limReρH(i,m)lim supn{Ψ(i)Hn(R)}1n(ρH(i,m))nlimReρQ(m)lim supn{ΨQn(R)}1n(ρQ(m))n,

    and the type of the HHDBSMPs is at most τQ(m).

    Note that the upper bound given in this theorem is attainable. We will illustrate this fact by introducing the following example:

    Example 6.1. Let {Q(m)n(x)} be the base of SMPs given by Q(m)n(x)=nn+Q(m)n(x), Q(m)0(x)=1, for which

    ΨQ(m)n(R)=nn[2+(Rn)n].

    It is easily seen that the base {Q(m)n(x)} is of order ρQ(m)=1 and type τQ(m)=e. Construct now the base {H(i,m)n(x)} such that

    H(i,m)n(x)=nn+ζn,i Q(m)ni(x),  Q(m)0(x)=1.

    Hence,

    ΨH(i,m)n(R)=nnζn,i[2+ζn,iRi(Rn)n].

    Therefore, the base {H(i,m)n(x)} is of order ρH(i,m)=1 and type τH(i,m)=e.

    The following example illustrates the best possibility of condition (2.8).

    Example 6.2. Let the base {Q(m)n(x)} of SMPs be defined by

    Q(m)n(x)={Q(m)n(x),n is even,Q(m)n(x)+μb2μ Q(m)2μ(x),n is odd and μ=nn,b>1.

    Hence,

    Q(m)n(x)=Q(m)n(x)μb2μQ(m)2μ(x),

    and

    ΨQ(m)n(R)=Rn+2μ(Rb)2μ.

    It is easy to see that the base Q(m)n(x) is of order ρQ(m)=1.

    For the HHDBSMPs {H(i,m)n(x)} it can verified that

    \begin{equation*} \mathbb{H}_n^{(i, m)}(x) = \begin{cases} \zeta_{n, i} \ \mathcal{Q}_{n-i}^{(m)}(x), &{ n\ is\ even, }\\ \zeta_{n, i} \ \mathcal{Q}_{n-i}^{(m)}(x)+\frac{\mu}{b^{2\mu}} \ \zeta_{2\mu, i} \ \mathcal{Q}_{2\mu-i}^{(m)}(x), &{ n\ is\ odd.} \end{cases} \end{equation*}

    Thus,

    \mathcal{Q}_{n-i}^{(m)}(x) = \frac{1}{\zeta_{n, i}}\mathbb{H}_n^{(i, m)}(x)-\frac{\mu}{b^{2\mu} }\ \frac{\zeta_{2\mu, i}}{\zeta_{n, i}} \ \mathbb{H}_{2\mu}^{(i, m)}(x).

    Consequently,

    \Psi_{\mathbb{H}_{n}^{(i, m)}}(R) = R^{n-i}+\frac{2\mu}{b^{i}} \ \frac{\zeta_{2\mu, i}}{\zeta_{n, i}} \ \left(\frac{R}{b}\right)^{2\mu-i}.

    Therefore, \rho_{\mathbb{H}^{(i, m)}} = 2 and \rho_{\mathbb{H}^{(i, m)}} > \rho_{Q^{(m)}}. This completes the proof.

    If the base of SMPs \{Q_{n}^{(m)}(x)\} is simple base ( D_{n} = n ) (see [1]), then the following corollary is a special case of Theorem 6.1.

    Corollary 6.1. When the simple base \{Q_{n}^{(m)}(x)\} of SMPs is of order \rho_{Q^{(m)}} and type \tau_{Q^{(m)}} , then the HHDBSMPs \{\mathbb{H}_n^{(i, m)}(x)\} will be of order \rho_{\mathbb{H}^{(i, m)}}\leq \rho_{Q^{(m)}} and type \tau_{\mathbb{H}^{(i, m)}}\leq \tau_{Q^{(m)}} whenever \rho_{\mathbb{H}^{(i, m)}} = \rho_{Q^{(m)}} .

    In the following, we determine the \mathbb{T}_{\rho_{Q^{(m)}}} -property of the HHDBs. The authors of [2] deduced \mathbb{T}_{\rho_{Q^{(m)}}} -property of the base \{Q^{(m)}_{n}(x)\} in Clifford analysis in open hyperball B(R) , closed hyperball \overline{B}(R) and at the origin are defined as follows:

    Definition 6.1 If the base \{Q^{(m)}_{n}(x)\} represents all ESMFs of order less than \rho_{Q^{(m)}} in \overline{B}(R) , B(R) or at the origin, then it is said to have property T_{\rho_{Q^{(m)}}} in \overline{B}(R) , B(R) or at the origin.

    Let

    \Psi_{Q^{(m)}}(R) = \limsup\limits_{n\rightarrow \infty}\ \frac{\log \ \Psi_{Q^{(m)}_{n}}(R)}{n \ \log \ n}.

    The following theorem concerning the property \mathbb{T}_{\rho_{Q^{(m)}}} of the base \{Q^{(m)}_{n}(x)\} (see [2]).

    Theorem 6.2. A base \{Q^{(m)}_{n}(x)\} to have the property T_{\rho_{Q^{(m)}}} for all ESMF of order less than \rho_{Q^{(m)}} in closed hyperball \overline{B}(R) , open hyperball B(R) or at the origin iff, \Psi_{Q^{(m)}}(R)\leq \frac{1}{\rho_{Q^{(m)}}} , \Psi_{Q^{(m)}}(r)\leq \frac{1}{\rho_{Q^{(m)}}} for all r < R or \Psi_{Q^{(m)}}(0^{+})\leq \frac{1}{\rho_{Q^{(m)}}}.

    Next, we construct the \mathbb{T}_{\rho_{\mathbb{H}^{(i, m)}}} -property of the HHDBSMPs in the closed hyperball \overline{B}(R) , for R > 0 .

    Theorem 6.3. Let \{Q_{n}^{(m)}(x)\} be the base of SMPs have \mathbb{T}\rho_{Q^{(m)}} -property in \overline{B}(R) , where R > 0 and for which the condition (2.9) is satisfied. Then the HHDBSMPs \{\mathbb{H}_n^{(i, m)}(x)\} have the same property.

    Proof. Suppose that the function \Psi_{\mathbb{H}^{(i, m)}}(R) given by:

    \begin{equation} \Psi_{\mathbb{H}^{(i, m)}}(R) = \limsup\limits_{n\rightarrow \infty}\ \frac{log \ \Psi_{\mathbb{H}^{(i, m)}_{n}}(R)}{n \ log \ n}, \end{equation} (6.3)

    where \Psi_{\mathbb{H}_{n}^{(i, m)}}(R) is the Cannon sum of the HHDBSMPs \{\mathbb{H}_n^{(i, m)}(x)\}. Then by using (2.9), (5.2) and (6.3), we obtain that

    \begin{equation} \Psi_{\mathbb{H}^{(i, m)}}(R)\leq \limsup\limits_{n\rightarrow \infty } \frac{\text{log}\zeta_{D_{n}, i} \ (\zeta_{D_{n}, i}+1)+ \text{log} \ \Psi_{Q_{n}^{(m)}}(R)}{n \ \text{log} \ n}\leq \Psi_{Q^{(m)}}(R) . \end{equation} (6.4)

    Since the base \{Q_{n}^{(m)}(x)\} has the property \mathbb{T}_{\rho_{Q^{(m)}}} in \overline{B}(R) , R > 0 . Hence by inequality (6.4) and Theorem 6.2, we have

    \Psi_{\mathbb{H}^{(i, m)}}(R)\leq \Psi_{Q^{(m)}}(R)\leq \frac{1}{\rho_{Q^{(m)}}},

    and the base \{\mathbb{H}_n^{(i, m)}(x)\} has the property \mathbb{T}_{\rho_{Q^{(m)}}} in \overline{B}(R) , R > 0 .

    The fact that HHDBSMPs \{\mathbb{H}_n^{(i, m)}(x)\} does not have the property \mathbb{T}_{\rho_{Q^{(m)}}} in \overline{B}(R) if the condition (2.9) is not satisfied is illustrated by the following example.

    Example 6.3. Let \{Q_{n}^{(m)}(x)\} be the base of SMPs, is defined by:

    \begin{equation*} Q_{n}^{(m)}(x ) = \begin{cases} \mathcal{Q}_{n}^{(m)}(x), &{ n\ is\ even, }\\ \mathcal{Q}_{n}^{(m)}(x)+ \ \frac{\mathcal{Q}_{s(n)}^{(m)}(x)}{2^{(n^{n})}}, &{ n\ is\ odd, } \end{cases} \end{equation*}

    where s(n) is the nearest even integer to n\log n+n^{n}.

    When n is odd, we obtain:

    \mathcal{Q}_{n}^{(m)}(x) = Q_{n}^{(m)}(x)-\frac{Q_{t(n)}^{(m)}(x)}{2^{(n^{n})}}.

    Hence,

    \Psi_{Q_{n}^{(m)}}(R) = R^{n}+2\frac{R^{t(n)}}{2^{(n^{n})}}.

    Putting R = 2 , it follows that

    \Psi_{Q_{n}^{(m)}}(2) = 2^{n}+2^{n\log n+1},

    so that

    \Psi_{Q^{(m)}}(2) = \limsup\limits_{n\rightarrow \infty}\ \frac{log \ \Psi_{Q_{n}^{(m)}}(2)}{n \ log \ n}\leq \log 2.

    It follows that, the base {Q_{n}^{(m)}(x)} has the \mathbb{T}_{\frac{1}{\log2}} -property in \overline{B}(2). The HHDBSMPs \{\mathbb{H}_n^{(i, m)}(x)\} is

    \begin{equation*} \mathbb{H}_n^{(i, m)}(x) = \begin{cases} \zeta_{n, i} \mathcal{Q}_{n-i}^{(m)}(x), & n \ \mbox{is even, }\\ \zeta_{n, i} \mathcal{Q}_{n-i}^{(m)}(x)+\zeta_{t(n), i} \frac{\mathcal{Q}_{t(n)-i}^{(m)}(x)}{2^{(n^{n})}}, &n \ \mbox{is odd.} \end{cases} \end{equation*}

    Hence, when n is odd, we obtain

    \Psi_{\mathbb{H}_{n}^{(i, m)}}(R) = R^{n-i}+2\frac{\zeta_{t(n), i}}{\zeta_{n, i}} \ \frac{R^{t(n)-i}}{2^{(n^{n})}},

    so that when R = 2 ,

    \Psi_{\mathbb{H}_{n}^{(i, m)}}(2) = 2^{n-i}+2\frac{\zeta_{t(n), i}}{\zeta_{n, i}} \ \frac{2^{t(n)-i}}{2^{(n^{n})}}.

    Thus,

    \Psi_{\mathbb{H}^{(i, m)}}(2) = \limsup\limits_{n\rightarrow \infty}\ \frac{\log \ \Psi_{\mathbb{H}_{n}^{(i, m)}}(2)}{n \ log \ n}\leq 1+\log 2,

    and the HHDBSMPs \mathbb{H}_n^{(i, m)}(x), does not have the \mathbb{T}_{\frac{1}{\log2}} -property in \overline{B}(2) as required.

    If the base of SMPs \{Q_{n}^{(m)}(x)\} is simple base ( D_{n} = n ) (see [1]), then the following corollary is a special case of Theorem 6.3.

    Corollary 6.2. When the simple base \{Q_{n}^{(m)}(x)\} of SMPs have \mathbb{T}\rho_{Q^{(m)}} -property in \overline{B}(R) , R > 0 . Then the HHDBSMPs \{\mathbb{H}_n^{(i, m)}(x)\} is also have the \mathbb{T}\rho_{Q^{(m)}} -property.

    In the following, we deduce that the base \{Q_{n}^{(m)}(x)\} and the HHDBs \{\mathbb{H}_{n}^{(i, m)}(x)\} have the same \mathbb{T}\rho_{Q^{(m)}} in an open hyperball B(R) , where R > 0 or at the origin.

    Theorem 6.4. Let \{Q_{n}^{(m)}(x)\} be a base of SMPs have the \mathbb{T}\rho_{Q^{(m)}} -property in B(R) , R > 0 or at the origin. Then the HHDBs \{\mathbb{H}_{n}^{(i, m)}(x)\} have the same property.

    Proof. Let \{Q_{n}^{(m)}(x)\} be have the property \mathbb{T}\rho_{Q^{(m)}} in B(R) , R > 0 , then

    \begin{equation} \Psi_{Q^{(m)}}(r)\leq \frac{1}{\rho_{Q^{(m)}}} \ \ \forall r < R . \end{equation} (6.5)

    It follows from (4.2) that

    \begin{equation} \Psi_{\mathbb{H}^{(i, m)}}(r) = \limsup\limits_{n\rightarrow \infty}\ \frac{\log \ \Psi_{\mathbb{H}_{n}^{(i, m)}}(r)}{n \log \ n}\leq \Psi_{Q^{(m)}}(r_{1}) , \end{equation} (6.6)

    such that r < r_{1} < R. Using (6.5) and (6.6), we have \Psi_{\mathbb{H}_{n}^{(i, m)}}(r)\leq \frac{1}{\rho_{Q^{(m)}}} \forall r < R and the base \{\mathbb{H}_{n}^{(i, m)}(x)\} has the property \mathbb{T}\rho_{Q^{(m)}} in an open hyperball B(R) , R > 0.

    Suppose that the base \{Q_{n}^{(m)}(x)\} has the property \mathbb{T}\rho_{Q^{(m)}} at the origin, then we get

    \begin{equation} \Psi_{Q^{(m)}}(o^{+})\leq \frac{1}{\rho_{Q^{(m)}}}. \end{equation} (6.7)

    Let r_{1}\rightarrow 0^{+} in (6.6), then by (6.7), we have

    \Psi_{\mathbb{H}^{(i, m)}}(o^{+}) \leq \Psi_{Q^{(m)}}(o^{+})\leq \frac{1}{\rho_{Q^{(m)}}},

    and the base \{\mathbb{H}_{n}^{(i, m)}(x)\} has the property \mathbb{T}\rho_{Q^{(m)}} at the origin.

    The problem of classical special functions can be considered as an application of bases of SMPs. Recently, the authors in [19,33] proved that the proper Bessel SMPs (PBSMPs) \{P_{n}^{(m)}(x)\} and the general Bessel SMPs (GBSMPs) \{G_{n}^{(m)}(x)\} are effective for \mathcal{M}[\overline{B}(R)] . Furthermore, recently in [34], the authors proved that the Chebyshev SMPs (CSMPs) \{T_{n}(x)\} is effective for \mathcal{M}[\overline{B}(1)] .

    The following results follows directly by applying Theorem 5.1.

    Corollary 7.1. The base of PBSMPs \{P_{n}^{(m)}(x)\} and the HHD of PBSMPs \{\mathbb{P}_n^{(i, m)}(x)\} have the same region of effectiveness for the class \mathcal{M}[\overline{B}(R)].

    Corollary 7.2. The base of GBSMPs \{G_{n}^{(m)}(x)\} and the HHD of GBSMPs \{\mathbb{G}_n^{(i, m)}(x)\} have the same region of effectiveness for the class \mathcal{M}[\overline{B}(R)].

    Corollary 7.3. The base of CSMPs \{T_{n}(x)\} and the HHD of CSMPs \{\mathbb{T}_n^{(i, m)}(x)\} have the same region of effectiveness for the class \mathcal{M}[\overline{B}(1)].

    In [27] the authors proved that the Bernoulli SMPs (BSMPs) \{B_{n}^{(m)}(x)\} is of order 1 and type \frac{1}{2\pi} and the Euler SMPs (ESMPs)) \{E_{n}^{(m)}(x)\} is of order 1 and type \frac{1}{\pi} .

    According to Theorem 6.1, we obtain the following corollaries:

    Corollary 7.4. The base of BSMPs \{B_{n}^{(m)}(x)\} and the HHD of BSMPs \{\mathbb{B}_{n}^{(i, m)}(x)\} are of the same order 1 and type \frac{1}{2\pi} .

    Corollary 7.5. The base of ESMPs \{B_{n}^{(m)}(x)\} and the HHD of ESMPs \{\mathbb{B}_{n}^{(i, m)}(x)\} are of the same order 1 and type \frac{1}{\pi} .

    Moreover, in [27], the BSMPs \{B_{n}^{(m)}(x)\} and the ESMPs \{E_{n}^{(m)}(x)\} have the property \mathbb{T}_{1} . According to Theorem 6.3, we conclude directly the following corollary:

    Corollary 7.6. If the BSMPs \{B_{n}^{(m)}(x)\} and the ESMPs \{E_{n}^{(m)}(x)\} have the property \mathbb{T}_{1} , then the HHD of BSMPs \{\mathbb{B}_{n}^{(i, m)}(x)\} and ESMPs \{\mathbb{E}_{n}^{(i, m)}(x)\} have the same property, respectively.

    Now, suppose that J_{N}(\mathbb{H}^{(i)}) is a polynomial of the operator \mathbb{H}^{(i)} as given in (3.1) such that

    J_{N}(\mathbb{H}^{(i)}) = \sum\limits_{j = 1}^{N}\lambda_{j} \ (\mathbb{H}^{(i)})^{j}, \ \ \lambda_{i}\in \mathcal{C}_{m},

    where (\mathbb{H}^{(i)})^{j} = (\mathbb{H}^{(i)})^{j-1}\mathbb{H}^{(i)}. Obviously that Theorems 4.1–4.4, 5.1, 6.1, 6.3 and 6.4 will be valid when we replace the base \{\mathbb{H}^{(i)} Q_{n}^{(m)}(x)\} by the base \{J_{N}(\mathbb{H}^{(i)}) Q_{n}^{(m)}(x)\}

    Similar results for the generalized hypercomplex Ruscheweyh derivative base \{J_{N}(\mathfrak{R}^{(i)}) Q_{n}^{(m)}(x)\} , where \mathfrak{R}^{(i)} is the hypercomplex Ruscheweyh derivative. These results generalize the result in [22].

    This work is mainly devoted to derive a generalized form for the Hasse operator in the Clifford setting. Using the defined operator, we accordingly construct the hypercomplex Hasse derivative bases (HHDBs). The approximation properties (effectiveness, order and type, the Property of \mathbb{T}\rho_{Q^{(m)}} ) have been describe for the derived HHDBSMPs in multiple regions in F-modules. Our results are considered as a modified generalization to those given in [8,9,10]. It is clear that that when x\in \mathcal C_{1} in Theorems 4.1–4.4, 5.1, 6.1, 6.3 and 6.4 results obtained by [8,9,10] yield. Additionally considering x to be an element of \mathcal C_{2} in Theorems 4.1–4.4, 5.1, 6.1, 6.3 and 6.4, our results coincide with the quaternion analysis \mathbb{H} . Our results improve and extend the corresponding ones in the Clifford analysis with regards to the region of effectiveness and the mode of increase of HDB (see [13,14]).

    As a result of the growing interest in fractional calculus and its numerous real-world applications, recent contributions were placed on representing analytic functions in terms of complex conformable fractional derivatives and integral bases in different domains in Fréchet spaces [35]. In [36], the authors investigated uncertain barrier swaption pricing problems based on the fractional differential equation in Caputo sense. Relevantly, the fraction Dirac operator constructed using Caput derivative in the case of Clifford variables were studied in [37]. Furthermore, in [38], the authors introduced a new class of time-fractional Dirac type operators with time-variable coefficients. It will be of great interest in the future to explore the convergence properties of fractional derivative bases in the context of Clifford analysis.

    The authors declare they have not used Artificial Intelligence (AI) tools in the creation of this article.

    The authors extend their appreciation to the Deanship of Scientific Research at King Khalid University for funding this work through large group Research Project under grant number RGP2/429/44.

    The authors declare no conflict of interest to disclose.



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