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Novel analysis of nonlinear dynamics of a fractional model for tuberculosis disease via the generalized Caputo fractional derivative operator (case study of Nigeria)

  • We propose a new mathematical framework of generalized fractional-order to investigate the tuberculosis model with treatment. Under the generalized Caputo fractional derivative notion, the system comprises a network of five nonlinear differential equations. Besides that, the equilibrium points, stability and basic reproductive number are calculated. The concerned derivative involves a power-law kernel and, very recently, it has been adapted for various applied problems. The existence findings for the fractional-order tuberculosis model are validated using the Banach and Leray-Schauder nonlinear alternative fixed point postulates. For the developed framework, we have generated various forms of Ulam's stability outcomes. To investigate the estimated response and nonlinear behaviour of the system under investigation, the efficient mathematical formulation known as the -Laplace Adomian decomposition technique algorithm was implemented. It is important to mention that, with the exception of numerous contemporary discussions, spatial coherence was considered throughout the fractionalization procedure of the classical model. Simulation and comparison analysis yield more versatile outcomes than the existing techniques.

    Citation: Saima Rashid, Yolanda Guerrero Sánchez, Jagdev Singh, Khadijah M Abualnaja. Novel analysis of nonlinear dynamics of a fractional model for tuberculosis disease via the generalized Caputo fractional derivative operator (case study of Nigeria)[J]. AIMS Mathematics, 2022, 7(6): 10096-10121. doi: 10.3934/math.2022562

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  • We propose a new mathematical framework of generalized fractional-order to investigate the tuberculosis model with treatment. Under the generalized Caputo fractional derivative notion, the system comprises a network of five nonlinear differential equations. Besides that, the equilibrium points, stability and basic reproductive number are calculated. The concerned derivative involves a power-law kernel and, very recently, it has been adapted for various applied problems. The existence findings for the fractional-order tuberculosis model are validated using the Banach and Leray-Schauder nonlinear alternative fixed point postulates. For the developed framework, we have generated various forms of Ulam's stability outcomes. To investigate the estimated response and nonlinear behaviour of the system under investigation, the efficient mathematical formulation known as the -Laplace Adomian decomposition technique algorithm was implemented. It is important to mention that, with the exception of numerous contemporary discussions, spatial coherence was considered throughout the fractionalization procedure of the classical model. Simulation and comparison analysis yield more versatile outcomes than the existing techniques.



    TB (Tuberculosis) is one of the communicable diseases caused by bacteria in the respiratory systems of humans. According to the World Health Organization (WHO), almost 10 million individuals were diagnosed with tuberculosis in 2017 and 1.5 million others died from TB worldwide [1]. Experts are concerned that a global growth in the number of TB patients will endanger a significant proportion of individuals [2]. The lungs, the cerebellum, the endocrine system, the peripheral nerve mechanism, the vertebral column, and other tissues and organs may indeed be disrupted by this microorganism. Tuberculosis infection has been found in multiple cultures throughout history, including Mesopotamia, Persia, and Greece (see [3]). At this moment, one-third of the globe's infections are caused by tuberculosis, and the number of contagious people is growing at a pace of one every second [4]. In 2015, the aforesaid ailment was among the ten leading contributors of mortality globally, with around 10.4 million people affected. That year, 1.8 million people died from contagious illnesses, including 0.4 million people infected with hepatitis and tuberculosis. Major states (Bangladesh, Burma, Ghana, Burma, Ethiopia, and Namibia) accounted for 60 percent of tuberculosis infection worldwide [5]. Author [6] reported that tuberculosis and hepatitis are the leading factors of mortality globally, especially in Sub-Saharan Africa. Additionally, the HIV/AIDS outbreak poses a severe challenge to several governments around the globe. It is conclusive proof that vaccinations such as Bacillus Calmatte-Guerine (BCG) prevent kids globally from severe illness acquisition [7]. As a response, contemporary medication has lately been employed to discover and cure underlying tuberculosis in order to minimize the bacteria's tendency to transmission from collapsing, because only representatives of the contagious category may disseminate the infection to people.

    Numerous processes and strategies are indeed being tried throughout the globe to address the source and prevent such maladies in the community. One of the most effective techniques is mathematical simulation, which enables us to comprehend the mechanisms of illness spread and propose methods for controlling illnesses in communities. The specified zone was formally established in 1927. Up to this point, a set of hypotheses have already been designed and examined (see [8,9,10,11,12]). In this approach, the following five frameworks for tuberculosis were developed in [13]:

    {dM(ϱ)dϱ=θζ(η+μ)M(ϱ),dN(ϱ)dϱ=(1θ)ζ+ηM(ϱ)βN(ϱ)P(ϱ)ζN(ϱ),dO(ϱ)dϱ=βN(ϱ)P(ϱ)(ϖ+φ+μ)O(ϱ),dP(ϱ)dϱ=φO(ϱ)(ϕ+μ+ψ)P(ϱ),dQ(ϱ)dϱ=ϖO(ϱ)+ϕP(ϱ)μQ(ϱ). (1.1)

    The total population N(ϱ)=M(ϱ)+N(ϱ)+O(ϱ)+P(ϱ)+Q(ϱ) has been classified into five groups according to the above-mentioned framework: Immunization group M, susceptibility group N, infected latent group O, infectious group P, and recovered group Q. The following are the characteristics of the system under evaluation: The signified indicates the immunological component at conception ζ, η reflects the proportion of farrowing off the medication, the genetic mortality value is designated by the sign μ, β denotes the tuberculosis peristaltic speed, the therapeutic efficacy of contagious predisposition is designated by ϖ, φ is the proportion of collapse of innate tuberculosis into extremely contagious tuberculosis, ϕ the effective remedy of contagious tuberculosis people, and the damage arising from the illness is represented by ψ.

    In most cases, classical calculus does not adequately investigate the complexities of real-life scenarios in science and technology. Fractional calculus has received a lot of emphasis in recent generations in an attempt to address this weakness. We certainly recognize that scientists are progressively using fractional calculus for numerical techniques [14,15,16,17,18,19,20,21,22,23,24,25,26]. As a result, we explore the system in (1.1) using generalized Caputo fractional derivative as described in the following:

    {(CDϑ0+M)(ϱ)=θζ(η+μ)M(ϱ),(CDϑ0+N)(ϱ)=(1θ)ζ+ηM(ϱ)βN(ϱ)P(ϱ)ζN(ϱ),(CDϑ0+O)(ϱ)=βN(ϱ)P(ϱ)(ϖ+φ+μ)O(ϱ),(CDϑ0+P)(ϱ)=φO(ϱ)(ϕ+μ+ψ)P(ϱ),(CDϑ0+Q)(ϱ)=ϖO(ϱ)+ϕP(ϱ)μQ(ϱ). (1.2)

    Model (1.2) is investigated under biologically viable initial settings:

    (M(0),N(0),O(0),P(0),Q(0))ϱ=(M0,N0,O0,P0,Q0)ϱ.

    We investigate the system 1.1 proposed by [13] under the generalized Caputo fractional derivative [27] in light of the above-mentioned debate. The major goal of this study is to use well-known fixed point formalism like Banach's and Leray-Schauder nonlinear alternatives to investigate the existence and uniqueness of the fractional tuberculosis model described in (1.2). Furthermore, the stability analysis of the system is explored from the perspective of various stabilities, such as Ulam's, Ulam-Hyers, generalized Ulam-Hyers, Ulam-Hyers-Rassias, and generalized Ulam-Hyers-Rassias stable. Also, a novel algorithm approach with the aid of -LADM to generate approximate fractional tuberculosis model solutions for different fractional derivative orders. Several observations on the suggested algorithm's convergence and stability are addressed. Additionally, experimental challenges are studied to demonstrate the suggested algorithm's efficacy, convenience, and characteristics.

    The rest of this paper is organized as follows. In Section 2, we accomplish the description and formulation of the model. Section 3 deals with the disease-free and endemic equilibrium points and the corresponding global stability analysis. In Section 4, we establish the existence and uniqueness of the solution to the model via generalized Caputo fractional derivative operator. In the last section, we consider the analytical results of the fractional model by incorporating the modified Laplace Adomian decomposition into the model. Moreover, in this section, we perform a numerical simulation to verify the effect of the designed strategy for different values of fractional order and different compartments of the model.

    This part states certain formulae, concepts, and essential findings for generalized Caputo fractional derivative and related formulas that will be relevant throughout the study. For further information, see [28,29].

    Definition 2.1. ([27]) For ϑ,>0, then the generalized fractional integral of the mapping f1 is denoted by Iϑa+1 and expressed as

    (Iϑa+1f1)(ϱ)=1Γ(ϑ)ϱa1(ϱs)ϑ1f1(s)dss1,ϱ>a10, (2.1)

    and Γ(z)=+0exp(s)sz1ds is the Euler-Gamma function.

    Definition 2.2. ([27]) For ϑ(0,1],>0, then the generalized fractional derivative of a continuous mapping f1:[0,+]R is denoted by Dϑa+1 is expressed as

    (Dϑa+1f1)(ϱ)=1Γ(1ϑ)ϱa1(ϱs)ϑf1(s)dss1,ϱ>a10. (2.2)

    Definition 2.3. ([27]) For ϑ(0,1],>0, then the generalized Caputo fractional derivative of the continuous mapping f1:[0,+]R is denoted by CDϑa+1 and expressed as

    (CDϑa+1f1)(ϱ)=1Γ(nϑ)ϱa1(ϱs)ϑ(ϕnf1)(s)dss1, (2.3)

    where ϱ>a10 and ϕ=ϱ1ϕddϱ.

    Definition 2.4. ([30]) The -Laplace transform of a continuous mapping f:[0,+]R is described as

    L{f1(ϱ)}(s)=0exp(sϱ)f1(ϱ)dϱ,(s)>0. (2.4)

    The -Laplace transform form of the generalized Caputo fractional derivative of a continuous mapping f1 is presented by [30]:

    L{(CDϑa+1f1)(ϱ)}=sϑL{f1(ϱ)}n1κ=0sϑκ1(Iϑϕnf1)(0). (2.5)

    Now we present a significant result, which is known as the Banach fixed point theorem, and it will be useful for our next results.

    Throughout this investigation, we symbolize Banach space by Bs and fixed point by (fp).

    Lemma 2.5. ([31]) Assume that a Bs of χ, and also, there be a nonempty subset Δ which is closed in χ. If there be a contraction map Υ:ΔΔ, then, Υ has a fp in Δ.

    Our next result is the well-known Leray-Schauder nonlinear alternative (LSNA), see [32].

    Lemma 2.6. ([32]) Assume that a Bs of χ and ˜Cχ assume to be closed and convex. Also, suppose that an open subset of ˜C is ˜V and 0˜V. Let there be a continuous compact map Δ:V_˜C, then either

    (i) Δ has fp in V_

    or

    (ii) there is a V (the frontier of ˜V in ˜C) and ν(0,1) with x1=νΔx1.

    Here, we investigate the TB-model infection via the generalized Caputo fractional derivative [27] and the interpretation of all variables is explained in the preceding sections.

    {(CDϑ0+M)(ϱ)=Λ1(ϱ,M,N,O,P,Q),(CDϑ0+N)(ϱ)=Λ2(ϱ,M,N,O,P,Q),(CDϑ0+O)(ϱ)=Λ3(ϱ,M,N,O,P,Q),(CDϑ0+P)(ϱ)=Λ4(ϱ,M,N,O,P,Q),(CDϑ0+Q(ϱ)=Λ5(ϱ,M,N,O,P,Q), (3.1)

    where CDϑ0+(.) signifies the generalized Caputo fractional derivative of order ϑ with ϑ(0,1] and >0. In the preceding setup, we streamline the paradigm (1.2) for ease of explanation.

    Also, the nonlinear mappings Λ1Λ5 are presented by

    {Λ1(ϱ,M,N,O,P,Q)=θζ(η+μ)M(ϱ),Λ2(ϱ,M,N,O,P,Q)=(1θ)ζ+ηM(ϱ)βN(ϱ)P(ϱ)ζN(ϱ),Λ3(ϱ,M,N,O,P,Q)=βN(ϱ)P(ϱ)(ϖ+φ+μ)O(ϱ),Λ4(ϱ,M,N,O,P,Q)=φO(ϱ)(ϕ+μ+ψ)P(ϱ),Λ5(ϱ,M,N,O,P,Q)=ϖO(ϱ)+ϕP(ϱ)μQ(ϱ), (3.2)

    having initial conditions (M(0),N(0),O(0),P(0),Q(0))ϱ=(M0,N0,O0,P0,Q0)ϱ.

    Next we state the epidemiologically feasible (positivity and boundedness) region of this investigation in Theorem 3.1 and illustrate that the region is positively invariant and bounded.

    Theorem 3.1. The epidemiologically feasible region of TB model (1.2) is presented by

    Ψ=:{(M,N,O,P,Q)R5+:0M+N+O+P+QNθζη+μ}. (3.3)

    The existence and uniqueness of the solution of model (1.2) are now proved, and it remains to show that the set Ψ defined in (3.3) is positively invariant. The following lemma will be used for the proof of Theorem 3.1.

    Lemma 3.2. (Generalized mean value theorem) ([33]) Suppose g1(x)C[a,b] and let CDϑ0+G(x)C[a,b],when0<ϑ1. Then we have G(x)=G(a)+1Γ(ϑ)CDϑ0+G(ξ)(xa)ϑ,>0, when 0ξx,x(a,b].

    Clearly, by utilizing by Lemma (3.2), if G(x)[0,b],CDϑ0+G(x)(0,b] and CDϑ0+G(x)0,x(0,b] when ϑ(0,1], then the function G(x) is n non-decreasing and if CDϑ0+G(x)0,x(0,b], then the mapping G(x) is non-increasing x[0,b].

    To show that Ψ is positively invariant, by means of Lemma 3.2, we have

    {(CDϑ0+M)|M=0=θζ,(CDϑ0+N)|N=0=(1θ)ζ+ηM(ϱ),(CDϑ0+O)|O=0=βN(ϱ)P(ϱ),(CDϑ0+P)|P=0=φO(ϱ),(CDϑ0+Q)|Q=0=ϖO(ϱ)+ϕP(ϱ). (3.4)

    It follows from (3.4) that each of the solution (1.2) is non-negative and remains in R5+, and so the set Ψ described in (3.3) is positively invariant for the system (1.2).

    Ultimately, to construct the boundedness of the solution of the fractional model (1.2), taking into consideration that all the parameters are positive, we continue by adding all equations of the model that presents

    CDϑ0+N(ϱ)=ζμN(ϱ)ζNμ(O+Q+P)ψPζμN(ϱ). (3.5)

    Applying Laplace transform leads to

    L(CDϑ0+N(ϱ)+μN(ϱ))L(ζ)sL(N)s1N(0)ζsL(N)(ζs+1+1sN(0)). (3.6)

    Applying the inverse transform, the solution is presented by

    N(ϱ)=ζϱa1(ϱs)ϑ(ϕnf1)(s)dss1+N(0)(ϱs)ϑ, (3.7)

    it is not difficult to observe that N(ϱ)ζ as ϱ. Hence (3.3) is the biologically feasible region of system (1.2).

    The disease-free equilibrium of system (1.2) is given by N0=(θζη+μ,(η+μ)(1θ)ζ+etaθζμ(η+μ),0,0,0) as the disease free equilibrium state

    M=θζη+μ,N=(ϖ+φ+μ)(ϕ+μ+ψ)βφ,O=(ϕ+μ+ψ)(ζβφ(μ+η)βφμθζμ(μ+η)(ϖ+φ+μ)(ϕ+μ+ψ))βφ(μ+η)(μ(ϕ+μ+ψ)+ϖ(μ+ψ)+ϖ(ϕ+μ+ψ)+φϕ),P=(ζβφ(μ+η)βφμθζμ(μ+η)(ϖ+ψ+μ)(ϕ+μ+ψ))φβφ(μ+η)(μ(ϕ+μ+ψ)+ϖ(μ+ψ)+ϖ(ϕ+μ+ψ)+φϕ),Q=(ϖ(ϕ+μ+ψ)+φϕ)(ζβφ(μ+η)βφμθζμ(μ+η)(ϖ+φ+μ)(ψ+μ+ϕ))μβφ(μ+η)(μ(ϕ+μ+ψ)+ϖ(μ+ψ)+ϖ(ϕ+μ+ψ)+φϕ) (3.8)

    as the endemic equilibrium state.

    In order to evaluate the basic reproduction number, we consider only the infectious classes of the model. Let V=(L,I)t, with the aid of the proposed system, we write

    dVdϱ=FV=[βLI0][(ϖ+φ+μ)LφL+(ϕ+μ+ϖ)I].

    The Jacobian matrices of F and V are given by

    J=[0βI000]andV=[ϖ+φ+μ0φ(ϕ+μ+ϖ)I].

    The inverse matrix of V is given by

    V1=[1ϖ+φ+μ0ϖ1ϕ+μ+ϖ].

    Hence, the next generation matrix JV1 is calculated a

    JV1=[βI0ϖ(ϖ+φ+μ)(ϖ+φ+ψ)βI0ϖ+φ+μ00]. (3.9)

    The spectral radius of the next generation matrix (3.9) gives the threshold quantity R0 [34]. Thus

    R0=βϖ(η+μμθ)ϖ(η+μ)(ϖ+φ+μ)(ϖ+ψ+φ).

    This quantity plays the key role in stability analysis and in finding conditions for the said purpose.

    Theorem 3.3. For R0, the system (1.2) has a unique equilibrium point N=(M,N,O,P,Q) given by (3.8). The global stability of the endemic equilibrium point is proved in Theorem 3.4 by utilizing the Lyapunov function method.

    Theorem 3.4. If R0>1, then the endemic equilibrium point N of system (1.2) is globally asymptotically stable in the region Ψ.

    Proof. Define a Lyapunov function candidate by

    (M,N,O,P,Q)=12((MM)+(NN)+(OO)+(Pp)+(QQ))2. (3.10)

    Then (M,N,O,P,Q)0 and (M,N,O,P,Q)=0. Also, ddϱ=[(M,N,O,P,Q)(M,N,O,P,Q)]dNdϱ.

    Since M,N,O,P,Q=ζδ and dNdϱ=ζμN(ϱ)ζNμ(O+Q+P)ψP, we have

    ddϱ=(ζμN)(ζμN(ϱ)ζNμ(O+Q+P)ψP)0.

    Note that at the endemic equilibrium point, we have Nζ/δ. Hence, it follows that ddϱ0 and ddϱ=0 if and only if M=M,N=N,O=O,P=P,Q=Q. Therefore the largest closed and bounded invariant set in {M,N,O,P,QΨ} is the set {N:N=(M,N,O,P,Q)}. By LaSalle's invariance principle the unique equilibrium point N is globally asymptotically stable when R0>1 in the region Ψ.

    In this section, we analyze the local stability of the abstaining-free equilibrium and the abstaining equilibrium.

    Theorem 3.5. The abstaining-free equilibrium N0 is locally asymptotically stable if R0<1, whereas N0 is unstable if R0>1.

    Proof. The Jacobian matrix at N0 is given by

    J=[(η+μ)0000η(βN+ζ)0βN00βP(ϖ+φ+μ)βN000φ(ϕ+μ+ψ)000ϖϕμ]. (3.11)

    It follows thatJ are

    det(JλI)=0.
    det[(η+μ+λ)0000η(βN+ζ+λ)0βN00βP(ϖ+φ+μ+λ)βN000φ(ϕ+μ+ψ+λ)000ϖϕ(μ+λ)]=0. (3.12)

    At the disease free equilibrium state N0=(θζη+μ,(η+μ)(1θ)ζ+etaθζμ(η+μ),0,0,0). Hence, evaluating the determinant and plugging 0 for P in (3.12) yields:

    (η+μ+λ)(μ+λ){(ϖ+φ+μ+λ)(ϕ+μ+ψ+λ)+βNφ}=0.

    Therefore, eigenvalues of the characteristic equation of λ1=λ2=μ and λ3=(η+μ)(R01). Therefore, all the eigenvalues of the characteristic equation are negative if R0<1. Thus, |Arg(λi)|=π>(ϑπ/2) for i=1,2,3. Hence, the equilibrium point N0 is locally asymptotically stable if R0<1 and unstable if R0>1.

    Now, we study the local stability of the abstaining equilibrium N.

    The Jacobian matrix at Nis given by

    JN=[(η+μ)0000ηβPζ0βN00βN(ϖ+φ+μ)βN000φ(ϕ+μ+ψ)000ϖϕμ]. (3.13)

    Its characteristic equation is

    λ3+c1λ2+c2λ+c3=0, (3.14)
    c1=(η+μ),c2=(β+ζ)(ϖ+φ+μ)(R01),c3=(η+μ)(ϕ+μ+ψ)(R01),c1c2c3=((η+μ)(β+ζ)(ϖ+φ+μ)(η+μ)(ϕ+μ+ψ))(R01). (3.15)

    If R0>1, then c1>0,c2>0,c3>0,c1c2>c3. So, the Routh-Hurwitz conditions are satisfied. Let D(U) denote the discriminant of the polynomial U(λ) given by (3.14), then

    D(U)=|1c1c2c3001c1c2c332c1c200032c1c200032c1c2|=4c31c3c21c2218c1c2c3+4c32+27c23. (3.16)

    From [35], we have the following theorem.

    Theorem 3.6. We assume that R0>1:

    (1) If D(U)>0 and 0<ϑ<1 along with =1, then N is locally asymptotically stable.

    (2) If D(U)>0 and ϑ<2/3 along with =1, then N is locally asymptotically stable.

    This portion explores the existence and uniqueness of elucidations to the provided framework (1.2) considering the fixed point theorems approach.

    Surmising that G=C([0,Q],R) represents the Bs containing continuous mappings from [0,Q] to R represented by the norm as

    |Ω|=supϱ[0,Q]|Ω(ϱ)|,where|Ω(ϱ)|=|M|+|N|+|O|+|P|+|Q|,

    and M,N,O,P,QG. By the virtue of (2.5), the system (1.2) can be expressed as the initial value problem (IVP)

    {(CDϑ0+Ω)(ϱ)=Λ(ϱ,Ω(ϱ)),Ω(0)=Ω00, (4.1)

    which is analogous to the integral equation of Volterra type

    Ω(ϱ)=Ω0+1Γ(ϑ)ϱ0(ϱs)ϑ1Λ(s,Ω(s))dss1, (4.2)

    where Ω(ϱ)=(M(ϱ),N(ϱ),O(ϱ),P(ϱ),Q(ϱ))Q for ȷ=1,...,5.

    Utilizing the fact of (4.2), an operator Θ:GG stated by

    (ΘΩ)(ϱ)=Ω0+1Γ(ϑ)ϱ0(ϱs)ϑ1Λ(s,Ω(s))dss1. (4.3)

    It is worth mentioning that the model (4.1), which is analogous to the problem (1.2), has elucidations only, if and only if the map Θ contains fp.

    Theorem 4.1. Surmise that there be a continuous mapping Λ:[0,Q]R such that there exists a constant LΛ>0, then

    |Λ(ϱ,Ω1(ϱ))Λ(ϱ,Ω2(ϱ))|LΛ|Ω1(ϱ)Ω2(ϱ)|,Ω1,Ω1G,andϱ[0,Q]. (4.4)

    If

    LΛQϑ<ϑΓ(ϑ+1), (4.5)

    then the model (4.1) has a fixed point on [0,Q]. Finally, the model (1.2) has a unique solution on [0,Q].

    Proof. Now, we convert the problem (4.1) into fp problem, Ω=ΘΩ, where Θ is illustrated in (4.3). Implementing the Banach contraction principle, we illustrate that Θ has a unique fp. To do this, suppose supϱ[0,Q]|Λ(ϱ,0)|=Υ1<. Choosing Gr1={ΩG:Ωr1} having

    r1Ω0ϑΓ(ϑ+1)+Υ1QϑϑΓ(ϑ+1)LΛQϑ. (4.6)

    It is noting that Gr1 is a bounded, closed and convex subset of G. Also, proving that ΥGr1Gr1. For any ΩGr, we have

    (ΘΩ)(ϱ)Ω0+1Γ(ϑ)ϱ0(ϱs)ϑ1|Λ(s,Ω(s))|dss1Ω0+1Γ(ϑ)ϱ0(ϱs)ϑ1[|Λ(s,Ω(s))Λ(s,0)|+|Λ(s,0)|]dss1Ω0+1Γ(ϑ)ϱ0(ϱs)ϑ1(LΛr1+Υ1)dss1Ω0+QϑϑΓ(ϑ+1)(LΛr1+Υ1)r1,

    which implies that ΥGr1Gr1.

    Furthermore we prove that Υ:Gr1G is a contraction mapping. For any Ω1,Ω2G and every ϱ[0,Q], we have

    |(ΘΩ1)(ϱ)(ΘΩ1)(ϱ)|1Γ(ϑ)ϱ0(ϱs)ϑ1[|Λ(s,Ω1(s))Λ(s,Ω2(s))||]dss1LΛΓ(ϑ)ϱ0(ϱs)ϑ1|Ω1(s)Ω2(s)||]dss1LΛQϑϑΓ(ϑ+1)Ω1Ω2. (4.7)

    It follows that

    ΘΩ1ΘΩ2[LΛQϑϑΓ(ϑ+1)]Ω1Ω2.

    As LΛQϑ/ϑΓ(ϑ+1)<1, then operator Υ is contraction mapping. Utilizing the fact of Lemma 2.5, the operator Υ has a fp. As a consequence, the problem (4.1) has a fixed solution on [0,Q]. Therefore, according to above analysis, we conclude that the model (1.2) has a unique solution on [0,Q.] This completes the proof. Our next result based on the Leray-Schauder nonlinear alternative (Lemma 2.6) is demonstrated as a new existence theorem.

    Theorem 4.2. Suppose that:

    (A1) a mapping ˜qC([0,Q,R+]) and a decreasing mapping H:[0,+)[0,+) satisfying sub-homogeneous assumption (i.e., H(θΩ)θH(Ω),θ1andΩR) such that

    |Λ(ϱ,Ω(ϱ))|˜q(ϱ)H(Ω(ϱ)),(ϱ,Ω)[0,Q]×R, (4.8)

    where ˜q0=supΩ[0,Q]{˜q(ϱ)}.

    (A2) There exists a constant Υ2>0 such that

    Υ2ϑΓ(ϑ+1)Ω0ϑΓ(ϑ+1)+˜q0H(Υ2)Qϑ>1. (4.9)

    Then, the Eq (4.1) that is analogous to the system (1.2) one or more solution on [0,Q].

    Proof. By means of the map Θ proposed in (4.3). Initially, we prove that the operator Θ maps bounded set into bounded sets in G. For a positive constant r2>0, assume that Gr2={ΩG:Ωr2} be a bounded ball in G. Under the hypothesis (A1), for ϱ[0,Q], we have

    |(ΘΩ)(ϱ)|Ω0+1Γ(ϑ)ϱ0(ϱs)ϑ1Λ(s,Ω(s))dss1Ω0+1Γ(ϑ)ϱ0(ϱs)ϑ1|Λ(s,Ω(s))|dss1Ω0+˜q0H(Ω)QϑϑΓ(ϑ+1),

    which yields

    (ΘΩ)Ω0+˜q0H(r2)QϑϑΓ(ϑ+1).

    Furthermore, we illustrate that the operator Θ maps bounded sets into equi-continuous sets of G. Surmise that l1,l2[0,Q] having l1<l2 and ΩGr2. Then we find

    |(ΘΩ)(l2)(ΘΩ)(l1)||1Γ(ϑ)l20(l2s)ϑ1Λ(s,Ω(s))dss11Γ(ϑ)l10(l1s)ϑ1Λ(s,Ω(s))dss1|˜q0H(Ω)ϑΓ(ϑ+1)(|lϑ2lϑ1|+2|l2l1|ϑ). (4.10)

    It is clear that ΩGr2, the right hand side of the inequality (4.10) approaches to zero as l2l1. Thus, in view of the Arzelá-Ascoli theorem, θ:GG is completely continuous.

    As a result, we illustrate that the boundedness of the collection of findings to Ω=κθΩ for κ(0,1). Now, assume that there be a solution Ω. So, for ϱ[0,Q], and subsequent technique analogous to the previous case, we attain

    |Ω(ϱ)|=|κ(θΩ)(ϱ)|Ω0+˜q0H(Ω)QϑϑΓ(ϑ+1). (4.11)

    Implementing the norm of the aforesaid inequality, for Ω[0,Q], it follows that

    ϑΓ(ϑ+1)ΩΩ0ϑΓ(ϑ+1)+˜q0H(Ω)Qϑ1. (4.12)

    Using the fact of (A2), there exists a constant Υ2>0 such that K:={ΩG:ΩΥ2|}. Observe that, the mapping Θ:ˉKC is continuous as well as completely continuous. So, the appropriate selection of ˉK, no as such ΩK exist Ω=κΘΩ for κ(0,1). Thus, by Leray-Schauder nonlinear alternative (Lemma 2.6), it is concluded that the map Θ has a fp as ΩˉK that proves that the system (1.2) has a unique solution on [0,Q]. This completes the proof.

    Here, we shall establish certain adequate assumptions in this article for the system (1.2) to fulfill the requirements of multiple types of stability. The accompanying definitions are required prior to stating Ulam stability theorem.

    Surmise that there be a positive real number ϵ>0 and a continuous mapping ΦΛ:[0,Q]R+. We have the subsequent variants

    |CDϑ0+y(ϱ)Λ(ϱ,y(ϱ))|ϵ,ϱ[0,Q], (5.1)
    |CDϑ0+y(ϱ)Λ(ϱ,y(ϱ))|ϵΦΛ(ϱ),ϱ[0,Q], (5.2)
    |CDϑ0+y(ϱ)Λ(ϱ,y(ϱ))|ΦΛ(ϱ),ϱ[0,Q], (5.3)

    where ϵ=max(ϵȷ)ϱ for ȷ=1,...,5.

    Definition 5.1. ([36]) We say that the Eq (4.1) is Ulam-Hyers stable if there exists a fixed CΛ such that for every ϵ>0 and for every elucidation yG of the variant (5.1) a elucidation ΩG of the Eq (4.1) having

    |y(ϱ)Ω(ϱ)|CΛϵ,ϱ[0,Q], (5.4)

    where CΛ=max(CΛ)ϱ for ȷ=1,..,5.

    Definition 5.2. ([36]) We say that the Eq (4.1) is generalized Ulam-Hyers stable if a mapping ΦΛC(R+,R+) having ΦΛ=0 such that for every elucidation yG of variant (5.2) a elucidation ΩG of the Eq (4.1) with

    |y(ϱ)Ω(ϱ)|ΦΛ(ϵ),ϱ[0,Q], (5.5)

    where ΦΛ=max(ΦΛȷ)ϱ for ȷ=1,..,5.

    Definition 5.3. ([36]) We say that the Eq (4.1) is Ulam-Hyers-Rassias stable in respective to ΦΛC([0,Q],R+) if a real constant ΥΦΛ such that for every ϵ>0 and for every elucidation yG of variant (5.2) a elucidation ΩG of the Eq (4.1) with

    |y(ϱ)Ω(ϱ)|ΥΦΛΦΛ(ϱ),ϱ[0,Q]. (5.6)

    Definition 5.4. ([36]) We say that the (4.1) is generalized Ulam-Hyers-Rassias stable in respective ΦΛ if a real number ΥΦΛ>0 such that for every elucidation yG of variant (5.3), a elucidation ΩG of the Eq (4.1) with

    |y(ϱ)Ω(ϱ)|ΥΦΛΦΛ(ϱ),ϱ[0,Q]. (5.7)

    Remark 1. Clearly, the aforesaid variants leads to the following conclusion that:

    (ⅰ) Inequality (5.4) Inequality (5.5);

    (ⅱ) Inequality (5.6) Inequality (5.7);

    (ⅲ) Inequality (5.6) for ΦΛ(.)=1 Inequality (5.4).

    Remark 2. A mapping yG is a elucidation of the variant (5.1) if and only if a mapping ωG (be influenced by y) such that the subsequent assumptions hold:

    (a) |ω(ϱ)|ϵ,ω=max(ωȷ)ϱ,ϱ[0,Q],

    (b) CDϑ0+y(ϱ)=Λ(ϱ,y(ϱ))+ω(ϱ),ϱ[0,Q].

    Remark 3. A mapping yG is a elucidation of the variant (5.2) if and only if a mapping νG (be influenced by y) such that the subsequent assumptions hold:

    (a) |ν(ϱ)|ϵΦΛ(ϱ),ν=max(ωȷ)ϱ,ϱ[0,Q],

    (b) CDϑ0+y(ϱ)=Λ(ϱ,y(ϱ))+ν(ϱ),ϱ[0,Q].

    We illustrate a vital purpose that can be employed to prove Ulam-Hyers and generalized Ulam-Hyers stability.

    Lemma 5.5. For 0<ϑ1 and >0. Let there be a solution yG of the variant (5.1), then y is a elucidation of the subsequent variant

    |y(ϱ)y01Γ(ϑ)ϱ0(ϱs)ϑ1Λ(s,y(s))dss1|QϑϑΓ(ϑ+1)ϵ. (5.8)

    Proof. Assume that there be a solution y of the variant (5.1). Using the fact of Remark 2-(ⅱ), we find

    {CDϑ0+y(ϱ)=Λ(ϱ,y(ϱ))+ω(ϱ),ϱ[0,Q],y(0)=y00. (5.9)

    Therefore, the elucidation of the Eq (5.9) can be expressed as

    y(ϱ)=y0+1Γ(ϑ)ϱ0(ϱs)ϑ1Λ(s,y(s))dss1+1Γ(ϑ)ϱ0(ϱs)ϑ1ω(s)dss1.

    Employing Remark 2-(ⅰ), we have

    |y(ϱ)y01Γ(ϑ)ϱ0(ϱs)ϑ1Λ(s,y(s))dss1|1Γ(ϑ)ϱ0(ϱs)ϑ1|ω(s)|dss1QϑϑΓ(ϑ+1)ϵ. (5.10)

    Hence, the variant (5.8) is proved.

    In our next result, we addressed the Ulam-Hyers stability and generalized Ulam-Hyers stability results.

    Theorem 5.6. Suppose for every ΩG and there be a continuous mapping Λ:[0,Q]×RR. If (4.4) and (4.5) are fulfilled, then the Eq (4.1) which is analogous to the system (1.2) is Ulam-Hyers and, finally, generalized Ulam-Hyers stable on [0,Q].

    Proof. Consider ϵ>0 and yG assumed to be a elucidation of the variant (5.1). Suppose ΩG be the fixed solution of the Eq (4.1),

    {CDϑ0+Ω(ϱ)=Λ(ϱ,Ω(ϱ)),ϱ[0,Q],Ω(0)=Ω0.

    Utilizing the fact of (4.1), Lemma 5.5 and by means of triangular inequality, we attain

    |y(ϱ)Ω(ϱ)||y(ϱ)Ω01Γ(ϑ)ϱ0(ϱs)ϑ1Λ(s,Ω(s))dss1||y(ϱ)y01Γ(ϑ)ϱ0(ϱs)ϑ1Λ(s,z(s))dss1+1Γ(ϑ)ϱ0(ϱs)ϑ1|Λ(s,z(s))Λ(s,Ω(s))|dss1||y(ϱ)y01Γ(ϑ)ϱ0(ϱs)ϑ1Λ(s,z(s))dss1|+LΛΓ(ϑ)ϱ0(ϱs)ϑ1|y(ϱ)Ω(ϱ)|dss1QϑϑΓ(ϑ+1)ϵ+LΛQϑϑΓ(ϑ+1)|y(ϱ)Ω(ϱ)|. (5.11)

    In view of Definition 5.1, we have

    CΛ=QϑϑΓ(ϑ+1)/(1LΛQϑϑΓ(ϑ+1)). (5.12)

    Thus, the system (1.2) is Ulam-Hyers stable. Now, by employing ΦΛ(ϵ)=CΛϵ such that ΦΛ(0)=0 provides that the system (1.2) is generalized Ulam-Hyers stable. This completes the proof.

    To prove our next result, we consider the following hypothesis:

    (A3) There exists an increasing mapping ΦΛG and λΦΛ>0, such that for fixed ϱ[0,Q], the subsequent formulation holds:

    Iϑ0+ΦΛ(ϱ)λΦΛΦΛ(ϱ). (5.13)

    Further, we demonstrate a significant result that will be considered in our coming findings of the Ulam-Hyers-Rassias and generalized Ulam-Hyers-Rassias stability consequences.

    Lemma 5.7. For 0<ϑ1 and >0 and there be a solution yG of the variant (5.2), then y is a elucidation of the subsequent variant

    |y(ϱ)y0Iϑ0+Λ(ϱ,y(ϱ))|ϵλΦΛΦΛ(ϱ). (5.14)

    Proof. Suppose there be a solution y of the variant (5.2). In view of Remark 3-(ⅱ), we find

    {CDϑ0+y(ϱ)=Λ(ϱ,y(ϱ))+ν(ϱ),ϱ[0,Q],y(0)=y0. (5.15)

    Therefore, the solution of the problem (5.15) can be expressed as

    y(ϱ)=y0+Iϑ0+Λ(ϱ,y(ϱ))+Iϑ0+ν(ϱ).

    Employing Remark 3-(ⅰ), we have

    |y(ϱ)y0Iϑ0+Λ(ϱ,y(ϱ))|Iϑ0+|ν(ϱ)|ϵIϑ0+ΦΛ(ϱ)ϵλΦΛΦΛ(ϱ).

    Thus, the variant (5.14) is acquired.

    As a final outcome, we are able to establish Ulam-Hyers-Rassias and generalized Ulam-Hyers-Rassias stability.

    Theorem 5.8. Suppose that there be a continuous mapping Λ:[0,Q]×RR for each ΩR. If (4.4), (A2) and (4.5) are fulfilled, then the Eq (4.1) which is similar to the system (1.2) is Ulam-Hyers-Rassias and, consequently, generalized Ulam-Hyers-Rassias stable on [0,Q].

    Proof. Surmise that ϵ>0 and there be a elucidation yG of the variant (5.3). Also, assume that ΩG be a fixed solution of (4.1). Employing (4.2) and Lemma 5.7, we have

    |y(ϱ)Ω(ϱ)||y(ϱ)Ω0Iϑ0+Λ(ϱ,Ω(ϱ))||y(ϱ)y0Iϑ0+Λ(ϱ,z(ϱ))|+1Γ(ϑ)ϱ0(ϱs)ϑ1|Λ(s,z(s))Λ(s,Ω(s))|dss1|y(ϱ)y0Iϑ0+Λ(ϱ,z(ϱ))|+LΛΓ(ϑ)ϱ0(ϱs)ϑ1|z(s)Ω(s)|dss1ϵλΦΛΦΛ(ϱ)+LΛQϑϑΓ(ϑ+1)|y(ϱ)Ω(ϱ)|, (5.16)

    which implies that |y(ϱ)Ω(ϱ)|ϵλΦΛΦΛ(ϱ)/(1LΛQϑϑΓ(ϑ+1)). By choosing

    ΥΦΛ=ϵλΦΛ/(1LΛQϑϑΓ(ϑ+1)). (5.17)

    Therefore, we attain the subsequent variant

    |y(ϱ)Ω(ϱ)|ΥΦΛϵΦΛ(ϱ). (5.18)

    Consequently, the model (1.2) is Ulam-Hyers-Rassias stable. Also, taking ϵ=1, in (5.18), with ΦΛ(0)=0, then the framework (1.2) is generalized Ulam-Hyers-Rassias stable. This completes the proof.

    In order to establish the series formulation of the proposed problem, we employ the modified Laplace transform on both sides of (1.2). We develop the subsequent formulation as follows:

    {sϑL[M(ϱ)]sϑ1M(0)=L[θζ(η+μ)M(ϱ)],sϑL[N(ϱ)]sϑ1N(0)=L[(1θ)ζ+ηM(ϱ)βN(ϱ)P(ϱ)ζN(ϱ)],sϑL[O(ϱ)]sϑ1O(0)=L[βN(ϱ)P(ϱ)(ϖ+φ+μ)O(ϱ)],sϑL[P(ϱ)]sϑ1P(0)=L[φO(ϱ)(ϕ+μ+ψ)P(ϱ)],sϑL[Q(ϱ)]sϑ1Q(0)=L[ϖO(ϱ)+ϕP(ϱ)μQ(ϱ)].

    Employing the initial conditions and suitable arrangements yields

    {L[M(ϱ)]=M0s+1sϑL[θζ(η+μ)M(ϱ)],L[N(ϱ)]=N0s+1sϑL[(1θ)ζ+ηM(ϱ)βN(ϱ)P(ϱ)ζN(ϱ)],L[O(ϱ)]=O0s+1sϑL[βN(ϱ)P(ϱ)(ϖ+φ+μ)O(ϱ)],L[P(ϱ)]=P0s+1sϑL[φO(ϱ)(ϕ+μ+ψ)P(ϱ)],L[Q(ϱ)]=Q0s+1sϑL[ϖO(ϱ)+ϕP(ϱ)μQ(ϱ)].

    Let us surmise that the solution we calculate in an infinite series formulation is as follows:

    M(ϱ)=+n=0Mn(ϱ),N(ϱ)=+n=0Nn(ϱ),O(ϱ)=+n=0On(ϱ),P(ϱ)=+n=0Pn(ϱ),Q(ϱ)=+n=0Qn(ϱ) (6.1)

    and the non-linearity factor NP can be decomposed by the Adomian polynomial as follows:

    N(ϱ)P(ϱ)=+n=0Jn(ϱ), (6.2)

    where

    Jn=1Γ(n+1)dndλn[(nκ=0λκNκ)(nκ=0λκPκ)]λ=0.

    Some first few Adomian polynomials are expressed as

    Jn={N0(ϱ)P0(ϱ),n=0,N0(ϱ)P1(ϱ)+N1(ϱ)P0(ϱ),n=1,N0(ϱ)P2(ϱ)+N1(ϱ)P1(ϱ)+N2(ϱ)P1(ϱ),n=2,N0(ϱ)P3(ϱ)+N1(ϱ)P2(ϱ)+N2(ϱ)P1(ϱ)+N3(ϱ)P0(ϱ),n=3,N0(ϱ)Pn(ϱ)+N1(ϱ)P(n1)(ϱ)+...+N(n1)(ϱ)P1(ϱ)+N(n)(ϱ)P0(ϱ),n=n. (6.3)

    By the virtue of (6.1)–(6.3), we have

    {L[+κ=0Mκ(ϱ)]=M0s+1sϑL[θζ(η+μ)+κ=0Mκ(ϱ)],L[+κ=0Nκ(ϱ)]=N0s+1sϑL[(1θ)ζ+η+κ=0Mκ(ϱ)β+κ=0Jκ(ϱ)ζ+κ=0Nκ(ϱ)],L[+κ=0Oκ(ϱ)]=O0s+1sϑL[β+κ=0Jκ(ϖ+φ+μ)+κ=0Oκ(ϱ)],L[+κ=0Pκ(ϱ)]=P0s+1sϑL[φ+κ=0Oκ(ϱ)(ϕ+μ+ψ)+κ=0Pκ(ϱ)],L[+κ=0Qκ(ϱ)]=Q0s+1sϑL[ϖ+κ=0Oκ(ϱ)+ϕ+κ=0Pκ(ϱ)μ+κ=0Qκ(ϱ)].

    Now, equating terms on both sides and after employing the -Laplace inverse transform, we get

    Step Ⅰ. For n=0, we have

    {M0(ϱ)=M0+θζΓ(ϑ+1)(ϱ)ϑ,N0(ϱ)=N0+(1θ)ζ1Γ(ϑ+1)(ϱ)ϑ,O0(ϱ)=O0,P0(ϱ)=P0,Q0(ϱ)=Q0.

    Step Ⅱ. For n=1, we have

    {M1(ϱ)=1sϑL[(η+μ)M0(ϱ)],N1(ϱ)=1sϑL[ηM0(ϱ)βJ0(ϱ)ζN0(ϱ)],O1(ϱ)=1sϑL[βJ0(ϖ+φ+μ)O0(ϱ)],P1(ϱ)=1sϑL[φO0(ϱ)(ϕ+μ+ψ)P0(ϱ)],Q1(ϱ)=1sϑL[ϖO0(ϱ)+ϕP0(ϱ)μQ0(ϱ)].

    Again, employing the inverse -Laplace transform on both sides of the above system, we have

    {M1(ϱ)=(η+μ)M01Γ(ϑ+1)(ϱ)ϑ(η+μ)θζΓ(2ϑ+1)(ϱ)2ϑ,N1(ϱ)=(ηM0βP0N0ζN0)(ϱ)ϑΓ(ϑ+1)+(ηθζβζ(1θ)P0ζ2(1θ))(ϱ)2ϑΓ(2ϑ+1),O1(ϱ)=(βP0N0(ϖ+φ+μ)O0)(ϱ)ϑΓ(ϑ+1)+βP0(1θ)ζ(ϱ)2ϑΓ(2ϑ+1),P1(ϱ)=(φO0(ϕ+μ+ψ)P0)(ϱ)ϑΓ(ϑ+1),Q1(ϱ)=(ϖO0+ϕP0μQ0)(ϱ)ϑΓ(ϑ+1).

    Step Ⅲ. For n=2, we have

    {M2(ϱ)=1sϑL[(η+μ)M1(ϱ)],N2(ϱ)=1sϑL[ηM1(ϱ)βJ1(ϱ)ζN1(ϱ)],O2(ϱ)=1sϑL[βJ1(ϖ+φ+μ)O1(ϱ)],P2(ϱ)=1sϑL[φO1(ϱ)(ϕ+μ+ψ)P1(ϱ)],Q2(ϱ)=1sϑL[ϖO1(ϱ)+ϕP1(ϱ)μQ1(ϱ)].

    Further, employing the inverse -Laplace transform on both sides of the above system, we have

    {M2(ϱ)=(η+μ)2M01Γ(2ϑ+1)(ϱ)2ϑ+(η+μ)2θζΓ(3ϑ+1)(ϱ)3ϑ,N2(ϱ)=(ηM0P0βP20N0ζN0P0+N0(φO0(ϕ+μ+ψ)P0)ηM0(η+μ)ζ(ηM0βP0N0ζN0))(ϱ)2ϑΓ(2ϑ+1)+(ζ(1θ)(φO0(ϕ+μ+ψ)P0)ηθζ(μ+η)ζ2ηθβζ4(1θ)2P0)(ϱ)3ϑΓ(3ϑ+1)+P0(ηθζβζ(1θ)P0ζ2(1θ))Γ(2ϑ+1)(ϱ)3ϑΓ2(ϑ+1)Γ(3ϑ+1),O2(ϱ)=(N0(βφO0βP0(ϕ+μ+ψ))+β(ηP0M0βP20N0ζP0N0)βP0N0(ϖ+φ+μ)O0(ϖ+φ+μ)2)(ϱ)2ϑΓ(2ϑ+1)+ζ(1θ)(βφO0βP0)Γ(2ϑ+1)(ϱ)3ϑΓ2(ϑ+1)Γ(3ϑ+1)+βP0(ηθζβζ(1θ)P0ζ2(1θ)P0ζ(1θ)(ϖ+φ+μ))(ϱ)3ϑΓ(3ϑ+1),P2(ϱ)=(φβP0N0φO0(ϖ+φ+μ)(ϕ+μ+ψ)(φO0P0(μ+ϕ+ψ)))(ϱ)2ϑΓ(2ϑ+1)+φβ(1θ)P0(ϱ)2ϑΓ(2ϑ+1),Q2(ϱ)=(ϖβP0N0ϖ(ϖ+φ+μ)O0+ϕ(φO0P0(ϕ+μ+ψ))μ(ϖO0+ϕP0μQ0))(ϱ)2ϑΓ(2ϑ+1)+ϖβζ(1θ)P0(ϱ)3ϑΓ(3ϑ+1).

    Continuing in the same way, we can obtained the recursive terms n3. Thus, we attain the desired series solution as follows:

    {M(ϱ)=M0(ϱ)+M1(ϱ)+M2(ϱ)+...,N(ϱ)=N0(ϱ)+N1(ϱ)+N2(ϱ)+...,O(ϱ)=O0(ϱ)+O1(ϱ)+O2(ϱ)+...,P(ϱ)=P0(ϱ)+P1(ϱ)+P2(ϱ)+...,Q(ϱ)=Q0(ϱ)+Q1(ϱ)+Q2(ϱ)+.... (6.4)

    Theorem 6.1. Suppose there be a Banach space and T:χχ be a contractive nonlinear operator such that U,˜Uχ,T(U)T(˜U)χKU˜Uχ,K(0,1). Applying the Banach contraction principle, T has a unique fixed point U such that TU=U, where U=(u,v,w). Employing -LADM, the series presented in (6.10) can be expressed as

    Un=TUn1,Un1=n1ȷ=1Uȷ,ȷ=1,2,3,..., (6.5)

    and suppose that U0=U0Gr1(U), where Gr1(U)=uχ:uUχ<r1, then we have

    (i) Un1Gr1(U);

    (ii) limn+Un=U.

    Proof. The proof of the following theorem can be developed in an analogous manner as in [37].

    In what follows, we provide simulation solutions as well as representations for the estimation algorithm of the model under investigation in this section of the article. As a starting point, we use the approximate values from Table 1. In view of these variables, we estimate the following series solution:

    {M(ϱ)=904.194(ϱ)ϑΓ(ϑ+1)+0.192411(ϱ)2ϑΓ(2ϑ+1)0.008966(ϱ)3ϑΓ(3ϑ+1),N(ϱ)=4001823.36(ϱ)ϑΓ(ϑ+1)+8408.2894(ϱ)2ϑΓ(2ϑ+1)39200.2682(ϱ)3ϑΓ(3ϑ+1)355.6365Γ(2ϑ+1)(ϱ)3ϑΓ2(ϑ+1)Γ(3ϑ+1),O(ϱ)=100+18211.44(ϱ)ϑΓ(ϑ+1)8488.5579(ϱ)2ϑΓ(2ϑ+1)+39597.60959(ϱ)3ϑΓ(3ϑ+1)+355.6365Γ(2ϑ+1)(ϱ)3ϑΓ2(ϑ+1)Γ(3ϑ+1),P(ϱ)=502.14545(ϱ)ϑΓ(ϑ+1)+22.6071(ϱ)2ϑΓ(2ϑ+1)106.7888(ϱ)3ϑΓ(3ϑ+1),Q(ϱ)=10+4.0454(ϱ)ϑΓ(ϑ+1)+61.8304(ϱ)2ϑΓ(2ϑ+1)+289.93398(ϱ)3ϑΓ(3ϑ+1). (7.1)
    Table 1.  Table of parameterized settings considered in the problem (1.2) for simulations.
    Population/parameters Explanation
    N=500 Overall Population
    M0=90 Immunized Population
    N0=400 Susceptible Population
    O0=100 latently infected Population
    P0=50 Infected Population
    Q0=50 Recovered Population
    ζ=1 Consistent procurement
    θ=65/1000 Proportion immunized at birth
    η=256/10000 proportion of weaning off the inoculation
    μ=21/1000 Natural death rate
    β=9091/100000 TB contraction proportion
    ϖ=342/10000 Efficacious treatment of infectious proportion
    φ=124/1000 Proportion of latent TB into highly contagious TB
    ϕ=16709/1000000 Satisfactorily healed of contagious TB patients
    ψ=30/1000 Death consequence of TB transmission.

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    Now we display the result up to four components in Figures 15, which are associated with various fractional orders, which can be seen in (7.1) in Figures 15. The vaccinated community diminishes with distinct fractional orders at various proportions, as seen in Figure 1(a). Similarly, as demonstrated in Figure 2(a), the susceptible community is expanding. As illustrated in Figures 3(a) and 4(a), both infected and innately affected communities are proliferating. As a result of the susceptible community growing sick or insidiously afflicted. If a suitable treatment is adopted, the proportion of people who have been cured will rise, as illustrated in Figure 5(a). The mechanism of demographic rise or decline is generally quickest at smaller fractional orders and then flips, and the higher the fractional order, the more rapid the procedure of growing population or reduction in the appropriate compartment.On the other hand, fractional order derivatives can describe behaviour extremely broadly. As time progresses, the recoverable community progressively grows and tends to a dynamic equilibrium, as noticed in Figure 5(a).

    Figure 1.  (a) Simulation of the approximate results of the Immunized class M(ϱ) for various fractional order ϑ=1,0.9,0.8,0.7,0.6. (b) Comparison analysis of the generalized Caputo fractional derivative and the Caputo Fabrizio fractional derivative operator of the Immunized class M(ϱ) when ϑ=1 and =0.67.
    Figure 2.  (a) Simulation of the approximate results of the Susceptible class N(ϱ) for various fractional order ϑ=1,0.9,0.8,0.7,0.6. (b) Comparison analysis of the generalized Caputo fractional derivative and the Caputo Fabrizio fractional derivative operator of the Susceptible class N(ϱ) when ϑ=1 and =0.67.
    Figure 3.  (a) Simulation of the approximate results of the latently infected class O(ϱ) for various fractional order ϑ=1,0.9,0.8,0.7,0.6. (b) Comparison analysis of the generalized Caputo fractional derivative and the Caputo Fabrizio fractional derivative operator of the latently infected class O(ϱ) when ϑ=1 and =0.67.
    Figure 4.  (a) Simulation of the approximate results of the Infectious class P(ϱ) for various fractional order ϑ=1,0.9,0.8,0.7,0.6. (b) Comparison analysis of the generalized Caputo fractional derivative and the Caputo Fabrizio fractional derivative operator of the Infectious class P(ϱ) when ϑ=1 and =0.67.
    Figure 5.  (a) Simulation of the approximate results of the Recoverable class Q(ϱ) for various fractional order ϑ=1,0.9,0.8,0.7,0.6. (b) Comparison analysis of the generalized Caputo fractional derivative and the Caputo Fabrizio fractional derivative operator of the Recoverable class Q(ϱ) when ϑ=1 and =0.67.

    Figures 1(b)5(b), the approximate solutions for vaccinated M(ϱ), susceptible N(ϱ), innately affected O(ϱ), infected P(ϱ) and recovered R(ϱ) communities, derived with the -LADM exhibit a remarkable degree of precision when contrasted to the LADM solution computed by Ahmad et al. [38]. As a result, we may conclude that the -LADM approach is an adequate and trustworthy mathematical approach for solving linear and nonlinear differential equation systems in demographic dynamics. The visual depictions explicitly indicate that -LADM produces excellent outcomes once a given amount of space has passed. This is a highly handy strategy that will surely find usage in a variety of situations. So, the generalized Caputo fractional derivative operator has an added benefit over the Caputo-Fabrizio in that it does not require the determination of intricate integrals, and it has an edge over the -LADM in that it has a reasonable aim when utilizing predictive control width. As a result, it delivers an approximate solution that is effective.

    In this article, the generalized Caputo fractional derivative is employed to examine the mathematical formulation of a tuberculosis model using preventative medication. With the assistance of the Larey-Schauder dynamic substitute and Banach's fixed point hypothesis, we demonstrated that the response of the analyzed paradigm (1.2) is developed by the generalized Caputo fractional derivative. Furthermore, Ulam stability, such as Ulam-Hyers stable, generalized Ulam-Hyers stability, Ulam-Hyers-Rassias stable, and generalized Ulam-Hyers-Rassias stable, were adopted to assess the method's reliability. Then, using the Matlab program, we implemented the -LADM approach to provide estimated values for various fractional-order problems, and we discovered that the findings of the descriptive and predictive models (1.2) approaches to the classical ones when ϑ1. The comparison analysis shows that the projected scheme is in close agreement with the existing one. One can be successfully extended to several forms of fractional derivatives with analogous methodologies in numerous real-world applications for future development. We expect that this effort will serve as a viable replacement for numerous scientific projects.

    This research was supported by Taif University Research Supporting Project Number (TURSP-2020/217), Taif University, Taif, Saudi Arabia.

    The authors declare that they have no competing interests.



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