Research article

Nb-fuzzy metric spaces with topological properties and applications

  • Received: 08 August 2022 Revised: 17 November 2022 Accepted: 22 November 2022 Published: 26 December 2022
  • MSC : 47H10, 54A40, 54E35, 54E40, 54H25

  • Our aim is to introduce the notion of Nb-fuzzy metric space (FMS). We also define quasi N-FMS, and pseudo Nb-FMS with examples and counterexamples and prove a decomposition theorem for pseudo Nb-FMS. We prove various theorems related to the convergence of sequences and analyze topology of symmetric Nb-FMS. At last, we provide an application of q-contraction mapping as a Banach contraction principle (BCP) in the structure of symmetric Nb-FMS and applied it in the solution of integral equations and linear equations.

    Citation: Jerolina Fernandez, Hüseyin Işık, Neeraj Malviya, Fahd Jarad. Nb-fuzzy metric spaces with topological properties and applications[J]. AIMS Mathematics, 2023, 8(3): 5879-5898. doi: 10.3934/math.2023296

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  • Our aim is to introduce the notion of Nb-fuzzy metric space (FMS). We also define quasi N-FMS, and pseudo Nb-FMS with examples and counterexamples and prove a decomposition theorem for pseudo Nb-FMS. We prove various theorems related to the convergence of sequences and analyze topology of symmetric Nb-FMS. At last, we provide an application of q-contraction mapping as a Banach contraction principle (BCP) in the structure of symmetric Nb-FMS and applied it in the solution of integral equations and linear equations.



    The classical Hermite-Hadamard inequality is one of the most well-established inequalities in the theory of convex functions with geometrical interpretation and it has many applications. This inequality may be regarded as a refinement of the concept of convexity. Hermite-Hadamard inequality for convex functions has received renewed attention in recent years and a remarkable refinements and generalizations have been studied [1,2].

    The importance of the study of set-valued analysis from a theoretical point of view as well as from their applications is well known. Many advances in set-valued analysis have been motivated by control theory and dynamical games. Optimal control theory and mathematical programming were an engine driving these domains since the dawn of the sixties. Interval analysis is a particular case and it was introduced as an attempt to handle interval uncertainty that appears in many mathematical or computer models of some deterministic real-world phenomena.

    Furthermore, a few significant inequalities like Hermite-Hadamard and Ostrowski type inequalities have been established for interval valued functions in recent years. In [3,4], Chalco-Cano et al. established Ostrowski type inequalities for interval valued functions by using Hukuhara derivatives for interval valued functions. In [5], Román-Flores et al. established Minkowski and Beckenbach's inequalities for interval valued functions. For other related results we refer to the readers [6].

    In this paper, we establish Hermite-Hadamard type inequalities and He's inequality for interval-valued exponential type pre-invex functions in the Riemann-Liouville interval-valued fractional operator settings.

    We begin with recalling some basic concepts and notions in the convex analysis.

    Let the space of all intervals of is c and Λc given by

    Λ1=[Λ,Λ]={v|Λ<v<Λ},Λ,Λ.

    Various binary operations are given as follows [7]:

    Scalar multiplication: τ,

    τ.Λ1={[τΛ,τΛ],if0τ,0,ifτ=0,[τΛ,τΛ],ifτ0.

    Difference, addition, product and reciprocal for Λ1,Λ2c are respectively given by

    Λ1Λ2=[Λ1,Λ1][Λ2,Λ2]=[Λ1Λ2,Λ1Λ2],Λ1+Λ2=[Λ1,Λ1]+[Λ2,Λ2]=[Λ1+Λ2,Λ1+Λ2],Λ1×Λ2=[min{Λ1Λ2,Λ1Λ2,Λ1Λ2,Λ1Λ2},max{Λ1Λ2,Λ1Λ2,Λ1Λ2,Λ1Λ2}]={uv|uΛ1,vΛ2},1Λ={1v1|0v1Λ}=[1Λ,1Λ],Λ1.1Λ2={u.1v|uΛ1,0vΛ2}=[Λ1.1Λ2,Λ1.1Λ2].

    Let Λ,+ΛandΛ denote the collection of all closed intervals of , the collection of all positive intervals of and the collection of all negative intervals of respectively. In this paper, we examine a few algebraic properties of interval arithmetic.

    Definition 2.1. [7] A mapping Ω is called an interval-valued function of υ on [a1,b1] if it assigns a nonempty interval to every v[a1,b1], that is

    Ω(v)=[Ω(v),Ω(v)], (2.1)

    where Ω(υ)andΩ(υ) are both real valued functions.

    Consider any finite ordered subset be the partition of [a1,b1], that is

    :a1=a1,...,an=b1.

    The mesh of is

    mesh()=max{ai+1ai;i=1,...,n}.

    The Riemann sum of Ω:[a1,b1]Λ can be defined by

    ˜S(Ω,,c)=Σni=1Ω(di)(ai+1ai),

    where mesh()<c.

    Definition 2.2. [8] A mapping Ω:[a1,b1]Λ is called an interval-Riemann integrable on [a1,b1]ifΛΛ such that for every δ>0 satisfying

    d(˜S(Ω,,c),Λ)<δ,

    we have

    Λ1=(IR)b1a1Ω(v)dv. (2.2)

    Lemma 2.1. [9] Let Ω:[a1,b1]Λ be an interval-valued function as in (2.1), then it is interval-Riemann integrable if and only if

    (IR)b1a1Ω(v)dv=[(R)b1a1Ω(v)dv,(R)b1a1Ω(v)dv].

    In simple words, Ω is interval-Riemann integrable if and only if Ω(v)andΩ(v) are both Riemann integrable functions.

    Definition 2.3. [10] Let ΩL1[a1,b1], then the Riemann-Liouville fractional integrals of order m>0 with 0a1 are defined by

    Ima+1Ω(v)=1Γ(m)va1(vr)m1Ω(r)dr,v>a1, (2.3)
    Imb1Ω(v)=1Γ(m)b1v(rv)m1Ω(r)dr,v<b1. (2.4)

    Definition 2.4. [11,12] Let Ω:[a1,b1]Λ be an interval-valued, interval-Riemann integrable function as in (2.1), then the interval Riemann-Liouville fractional integrals of order m>0 with 0a1 are defined by

    Ima+1Ω(v)=1Γ(m)(IR)va1(vr)m1Ω(r)dr,v>a1, (2.5)
    Imb1Ω(v)=1Γ(m)(IR)b1v(rv)m1Ω(r)dr,v<b1. (2.6)

    Corollary 2.1. [12] Let Ω:[a1,b1]Λ be an interval-valued function as in (2.1) such that Ω(v)andΩ(v) are Riemann integrable functions, then

    Ima+1Ω(v)=[Ima+1Ω(v),Ima+1Ω(v)],
    Imb1Ω(v)=[Imb1Ω(v),Imb1Ω(v)].

    Definition 2.5. [13] A set Λn with respect to a vector function η:n×nn is called an invex set if

    b1+τη(a1,b1)Λ,a1,b1Λ,τ1[0,1].

    Definition 2.6. [13] A function Ω on the invex set Λ with respect to a vector function η:Λ×Λn is called pre-invex function if

    Ω(b1+τη(a1,b1))(1τ)Ω(b1)+τΩ(a1),a1,b1Λ,τ1[0,1]. (2.7)

    Lemma 2.2. [14,15] If Λ is open and η:Λ×Λ, then a1,b1Λ,τ,τ1,τ2[0,1], we have

    η(b1,b1+τη(a1,b1))=τη(a1,b1), (2.8)
    η(a1,b1+τη(a1,b1))=(1τ)η(a1,b1), (2.9)
    η(b1+τ2η(a1,b1),b1+τ1η(a1,b1))=(τ2τ1)η(a1,b1). (2.10)

    In [16], Noor presented Hermite-Hadamard-inequality for pre-invex function, as follows:

    Ω(2a1+η(b1,a1)2)1η(b1,a1)a1+η(b1,a1)a1Ω(v)dvΩ(a1)+Ω(b1)2.

    Definition 2.7. [15] Let us consider an interval-valued function Ω on the set Λ, then Ω is pre-invex interval valued function with respect to η on an invex set Λn with respect to a vector function η:Λ×Λn if

    Ω(b1+τ1η(a1,b1))(1τ1)Ω(b1)+τ1Ω(a1),a1,b1Λ,τ1[0,1]. (2.11)

    Taking motivation from the exponential type convexity proposed in [17], we introduce the following notion:

    Definition 2.8. A function Ω on the invex set Λ is called exponential-type pre-invex function with respect to a vector function η:Λ×Λn if

    Ω(b1+τ1η(a1,b1))(e(1τ1)1)Ω(b1)+(eτ11)Ω(a1),a1,b1Λ,τ1[0,1]. (2.12)

    It is important to note that a pre-invex function need not to be convex function. For example, the function f(x)=|x| is not a convex function but it is a pre-invex function with respect to η, where

    η(v,u)={uv,ifu0,v0,v0,u0,vu,otherwise.

    Theorem 2.1. Let Ω:[a1,b1] be an exponential-type pre-invex function with respect to a vector function η:Λ×Λn. If a1<b1 and ΩL[a1,b1], then we have

    12(e121)Ω(a1+12η(b1,a1))1η(b1,a1)a1+η(b1,a1)a1Ω(v)dv(e2)[Ω(a1)+Ω(b1)].

    Proof. At first, from exponential-type-pre-invexity of Ω, we have

    Ω(a1+12η(b1,a1))=Ω(12[b1+τ1η(a1,b1)]+12[a1+τ1η(b1,a1)])(e121)[Ω(b1+τ1η(a1,b1))+Ω(a1+τ1η(b1,a1))].

    Integrating the above inequality with respect to τ1[0,1] yields

    Ω(a1+12η(b1,a1))(e121)(10Ω(b1+τ1η(a1,b1))dτ1+10Ω(a1+τ1η(b1,a1))dτ1)=2(e121)η(b1,a1)a1+η(b1,a1)a1Ω(v)dv.

    Now, taking v=b1+τ1η(a1,b1) gives

    1η(b1,a1)a1+η(b1,a1)a1Ω(v)dv=10Ω(b1+τ1η(a1,b1))dτ110{(eτ11)Ω(a1)+(e(1τ1)1)Ω(b1)}dτ1=(e2)[Ω(a1)+Ω(b1)].

    This completes the proof.

    By merging the concepts of pre-invexity and exponential type pre-invexity, we propose the following notion:

    Definition 2.9. Let Λn be an invex set with respect to a vector function η:Λ×Λn. The interval valued function Ω on the set Λ is exponential-type pre-invex interval valued function with respect to η if

    Ω(b1+τ1η(a1,b1))(e(1τ1)1)Ω(b1)+(eτ11)Ω(a1),a1,b1Λ,τ1[0,1]. (2.13)

    Remark 2.1. In Definition 2.9, by taking h(τ1)=eτ11, where h:[0,1][a1,b1] and h0, then we get h-pre-invex interval valued function with respect to η, that is

    Ω(b1+τ1η(a1,b1))h(1τ1)Ω(b1)+h(τ1)Ω(a1),a1,b1Λ,τ1[0,1]. (2.14)

    Remark 2.2. Let Λn be an invex set with respect to a vector function η:n×nn. The interval valued function Ω on the set Λ is exponential-type-pre-invex function with respect to η if and only if Ω,Ω are exponential-type pre-invex functions with respect to η, that is

    Ω(b1+τ1η(a1,b1))(e(1τ1)1)Ω(b1)+(eτ11)Ω(a1),a1,b1Λ,τ1[0,1], (2.15)
    Ω(b1+τ1η(a1,b1))(e(1τ1)1)Ω(b1)+(eτ11)Ω(a1),a1,b1Λ,τ1[0,1]. (2.16)

    Remark 2.3. If Ω(v)=Ω(v), then we get (2.12).

    Remark 2.4. Since τ1eτ11 and 1τ1e1τ11 for all τ1[0,1], so every nonnegative pre-invex interval valued function with respect to η is also exponential-type pre-invex interval valued function with respect to η.

    In this section, we establish fractional Hermite-Hadamard type inequality for interval-valued exponential type pre-invex. The family of Lebesgue measurable interval-valued functions is denoted by L([v1,v2],0).

    Theorem 3.1. Let Λ be an open invex set with respect to η:Λ×Λ and a1,b1Λ with a1<a1+η(b1,a1). If Ω:[a1,a1+η(b1,a1)] is an exponential type pre-invex interval-valued function such that ΩL[a1,a1+η(b1,a1)] and m>0, then we have (considering Lemma 2.2 holds)

    1(e121)Ω(c1+12η(d1,c1))Γ(m+1)ηm(d1,c1)[Im(c1+η(d1,c1))Ω(c1)+Imc+1Ω(c1+η(d1,c1))]mP(Ω(c1+η(d1,c1))+Ω(c1)), (3.1)

    where

    P=1(m+1)(1)m[(em+e)(1)mΓ(m+1,1)+(m1)Γ(m+1,1)+((eme)(1)m+m+1)Γ(m+1)+2(1)m]. (3.2)

    Proof. Since Ω is an exponential type pre-invex interval-valued function, so

    1(e121)Ω(a1+12η(b1,a1))[Ω(a1)+Ω(b1)].

    Taking a1=c1+(1τ1)η(d1,c1) and b1=c1+(τ1)η(d1,c1) gives

    1(e121)Ω(c1+(1τ1)η(d1,c1)+12η(c1+(τ1)η(d1,c1),c1+(1τ1)η(d1,c1)))[Ω(c1+(1τ1)η(d1,c1))+Ω(c1+(τ1)η(d1,c1))],

    implies

    1(e121)Ω(c1+12η(d1,c1))[Ω(c1+(1τ1)η(d1,c1))+Ω(c1+(τ1)η(d1,c1))].

    By multiplying by τm11 on both sides and integrating over [0,1] with respect to τ1, we get

    (IR)10τm111(e121)Ω(c1+12η(d1,c1))dτ1(IR)10τm11[Ω(c1+(1τ1)η(d1,c1))+Ω(c1+(τ1)η(d1,c1))]dτ1,
    (IR)10τm111(e121)Ω(c1+12η(d1,c1))dτ1=[(R)10τm111(e121)Ω(c1+12η(d1,c1))dτ1,(R)10τm111(e121)Ω(c1+12η(d1,c1))dτ1],
    (IR)10τm111(e121)Ω(c1+12η(d1,c1))dτ1=[1m(e121)Ω(c1+12η(d1,c1)),1m(e121)Ω(c1+12η(d1,c1))]=1m(e121)Ω(c1+12η(d1,c1)), (3.3)
    (IR)10τm11Ω(c1+(τ1)η(d1,c1))=[1ηm(d1,c1)(R)c1+(τ1)η(d1,c1)c(ic)m1Ω(i)di,1ηm(d1,c1)(R)c1+(τ1)η(d1,c1)c(ic)m1Ω(i)di],
    (IR)10τm11Ω(c1+(τ1)η(d1,c1))=Γ(m)ηm(d1,c1)[Im(c1+η(d1,c1))Ω(c1),Im(c1+η(d1,c1))Ω(c1)]=Γ(m)ηm(d1,c1)Im(c1+η(d1,c1))Ω(c1). (3.4)

    Similarly

    (IR)10τm11Ω(c1+(1τ1)η(d1,c1))=Γ(m)ηm(d1,c1)[Imc+1Ω(c1+η(d1,c1)),Imc+1Ω(c1+η(d1,c1))]=Γ(m)ηm(d1,c1)Imc+1Ω(c1+η(d1,c1)). (3.5)

    From (3.3)–(3.5), we get

    1m(e121)Ω(c1+12η(d1,c1))Γ(m)ηm(d1,c1)[Im(c1+η(d1,c1))Ω(c1)+Imc+1Ω(c1+η(d1,c1))]. (3.6)

    Now, from the interval valued exponential type pre-invexity of Ω, we have

    Ω(c1+τ1η(d1,c1))=Ω(c1+η(d1,c1)+(1τ1)η(c1,c1+η(d1,c1)))(eτ11)Ω(c1+η(d1,c1))+(e(1τ1)1)Ω(c1). (3.7)

    Similarly

    Ω(c1+(1τ1)η(d1,c1))=Ω(c1+η(d1,c1)+(τ1)η(c1,c1+η(d1,c1)))(e(1τ1)1)Ω(c1+η(d1,c1))+(eτ11)Ω(c1). (3.8)

    Thus, by adding (3.7) and (3.8), we get

    Ω(c1+τ1η(d1,c1))+Ω(c1+(1τ1)η(d1,c1))[eτ1+e(1τ1)2](Ω(c1+η(d1,c1))+Ω(c1)).

    By multiplying by τm11 on both sides and integrating over [0,1] with respect to τ1, we get

    (IR)10τm11Ω(c1+τ1η(d1,c1))dτ1+(IR)10τm11Ω(c1+(1τ1)η(d1,c1))dτ1(IR)10τm11[eτ1+e(1τ1)2](Ω(c1+η(d1,c1))+Ω(c1))dτ1.

    Now, from (3.2) we get

    (IR)10τm11[eτ1+e(1τ1)2](Ω(c1+η(d1,c1))+Ω(c1))dτ1=[(R)10τm11[eτ1+e(1τ1)2](Ω(c1+η(d1,c1))+Ω(c1))dτ1,(R)10τm11[eτ1+e(1τ1)2](Ω(c1+η(d1,c1))+Ω(c1))dτ1]=[P(Ω(c1+η(d1,c1))+Ω(c1)),P(Ω(c1+η(d1,c1))+Ω(c1))]=P(Ω(c1+η(d1,c1))+Ω(c1)). (3.9)

    Also from (3.4), (3.5) and (3.9), we get

    Γ(m)ηm(d1,c1)[Im(c1+η(d1,c1))Ω(c1)+Imc+1Ω(c1+η(d1,c1))]P(Ω(c1+η(d1,c1))+Ω(c1)). (3.10)

    Combining (3.6) and (3.10), we get

    1(e121)Ω(c1+12η(d1,c1))Γ(m+1)ηm(d1,c1)[Im(c1+η(d1,c1))Ω(c1)+Imc+1Ω(c1+η(d1,c1))]mP(Ω(c1+η(d1,c1))+Ω(c1)).

    Corollary 3.1. If Ω(v)=Ω(v), then (3.1) leads to the following fractional inequality for exponential type pre-invex function:

    1(e121)Ω(c1+12η(d1,c1))Γ(m+1)ηm(d1,c1)[Im(c1+η(d1,c1))Ω(c1)+Imc+1Ω(c1+η(d1,c1))]mP(Ω(c1+η(d1,c1))+Ω(c1)).

    Theorem 3.2. Let Λ be an open invex set with respect to η:Λ×Λ and a1,b1Λ with a1<a1+η(b1,a1). If Ω,Ω1:[a1,a1+η(b1,a1)] are exponential type pre-invex interval-valued functions such that Ω,Ω1L[a1,a1+η(b1,a1)] and m>0, then we have (considering Lemma 2.2 holds)

    Γ(m)ηm(d1,c1)[Im(c1+η(d1,c1))Ω(c1).Ω1(c1)+Imc+1Ω(c1+η(d1,c1)).Ω1(c1+η(d1,c1))]P1Υ1(a1,a1+η(b1,a1))+2P2Υ2(a1,a1+η(b1,a1)), (3.11)

    where

    P1=e2Γ(m)e2Γ(m,2)2m+2eΓ(m,1)+2Γ(m,1)2Γ(m)(1)m+Γ(m)Γ(m,2)(1)m2m2eΓ(m)+2m, (3.12)
    P2=eΓ(m,1)+Γ(m,1)(1)mΓ(m)(1)meΓ(m)+em+1m, (3.13)
    Υ1(a1,a1+η(b1,a1))=[Ω(a1+η(b1,a1)).Ω1(a1+η(b1,a1))+Ω(a1).Ω1(a1)], (3.14)

    and

    Υ2(a1,a1+η(b1,a1))=[Ω(a1+η(b1,a1)).Ω1(a1)+Ω(a1).Ω1(a1+η(b1,a1))]. (3.15)

    Proof. Since ΩandΩ1 are exponential type pre-invex interval-valued functions, so we have

    Ω(a1+τ1η(b1,a1))=Ω(a1+η(b1,a1)+(1τ1)η(a1,a1+η(b1,a1)))(eτ11)Ω(a1+η(b1,a1))+(e(1τ1)1)Ω(a1)

    and

    Ω1(a1+τ1η(b1,a1))=Ω1(a1+η(b1,a1)+(1τ1)η(a1,a1+η(b1,a1)))(eτ11)Ω1(a1+η(b1,a1))+(e(1τ1)1)Ω1(a1).

    Since Ω,Ω1+Λ, so

    Ω(a1+τ1η(b1,a1)).Ω1(a1+τ1η(b1,a1))(eτ11)2Ω(a1+η(b1,a1)).Ω1(a1+η(b1,a1))+(e(1τ1)1)2Ω(a1).Ω1(a1)+(eτ11)(e(1τ1)1)[Ω(a1+η(b1,a1)).Ω1(a1)+Ω(a1).Ω1(a1+η(b1,a1))]. (3.16)

    Similarly, we have

    Ω(a1+(1τ1)η(b1,a1)).Ω1(a1+(1τ1)η(b1,a1))(e(1τ1)1)2Ω(a1+η(b1,a1)).Ω1(a1+η(b1,a1))+(eτ11)2Ω(a1).Ω1(a1)+(eτ11)(e(1τ1)1)[Ω(a1+η(b1,a1)).Ω1(a1)+Ω(a1).Ω1(a1+η(b1,a1))]. (3.17)

    Adding (3.16) and (3.17) yields

    Ω(a1+τ1η(b1,a1)).Ω1(a1+τ1η(b1,a1))+Ω(a1+(1τ1)η(b1,a1)).Ω1(a1+(1τ1)η(b1,a1))[(e(1τ1)1)2+(eτ11)2][Ω(a1+η(b1,a1)).Ω1(a1+η(b1,a1))+Ω(a1).Ω1(a1)]+2(eτ11)(e(1τ1)1)[Ω(a1+η(b1,a1)).Ω1(a1)+Ω(a1).Ω1(a1+η(b1,a1))].

    From (3.14) and (3.15), we have

    Ω(a1+τ1η(b1,a1)).Ω1(a1+τ1η(b1,a1))+Ω(a1+(1τ1)η(b1,a1)).Ω1(a1+(1τ1)η(b1,a1))[(e(1τ1)1)2+(eτ11)2]Υ1(a1,a1+η(b1,a1))+2(eτ11)(e(1τ1)1)Υ2(a1,a1+η(b1,a1)).

    Multiplying by τm11 on both sides and integrating over [0,1] with respect to τ1 gives

    (IR)10τm11Ω(a1+τ1η(b1,a1)).Ω1(a1+τ1η(b1,a1))dτ1+(IR)10τm11Ω(a1+(1τ1)η(b1,a1)).Ω1(a1+(1τ1)η(b1,a1))dτ1(IR)10τm11[(e(1τ1)1)2+(eτ11)2]Υ1(a1,a1+η(b1,a1))dτ1+2(IR)10τm11(eτ11)(e(1τ1)1)Υ2(a1,a1+η(b1,a1))dτ1.

    So

    (IR)10τm11Ω(a1+τ1η(b1,a1)).Ω1(a1+τ1η(b1,a1))dτ1=Γ(m)ηm(d1,c1)Im(c1+η(d1,c1))Ω(c1).Ω1(c1)

    and

    (IR)10τm11Ω(a1+(1τ1)η(b1,a1)).Ω1(a1+(1τ1)η(b1,a1))dτ1=Γ(m)ηm(d1,c1)Imc+1Ω(c1+η(d1,c1)).Ω1(c1+η(d1,c1)).

    From (3.12) and (3.13), we get

    (IR)10τm11[(e(1τ1)1)2+(eτ11)2]Υ1(a1,a1+η(b1,a1))dτ1=P1Υ1(a1,a1+η(b1,a1))

    and

    (IR)10τm11(eτ11)(e(1τ1)1)Υ2(a1,a1+η(b1,a1))dτ1=P2Υ2(a1,a1+η(b1,a1)).

    Thus,

    Γ(m)ηm(d1,c1)[Im(c1+η(d1,c1))Ω(c1).Ω1(c1)+Imc+1Ω(c1+η(d1,c1)).Ω1(c1+η(d1,c1))]P1Υ1(a1,a1+η(b1,a1))+2P2Υ2(a1,a1+η(b1,a1)).

    Corollary 3.2. If Ω(v)=Ω(v), then (3.11) leads to the following fractional inequality for exponential type pre-invex function:

    Γ(m)ηm(d1,c1)[Im(c1+η(d1,c1))Ω(c1).Ω1(c1)+Imc+1Ω(c1+η(d1,c1)).Ω1(c1+η(d1,c1))]P1Υ1(a1,a1+η(b1,a1))+2P2Υ2(a1,a1+η(b1,a1)).

    Theorem 3.3. Let Λ be an open invex set with respect to η:Λ×Λ and a1,b1Λ with a1<a1+η(b1,a1). If Ω,Ω1:[a1,a1+η(b1,a1)] are exponential type pre-invex interval-valued functions such that Ω,Ω1L[a1,a1+η(b1,a1)] and m>0, then from (3.12)–(3.15), we have (considering Lemma 2.2 holds)

    Ω(c1+12η(d1,c1)).Ω1(c1+12η(d1,c1))(e121)2[mP1Υ2(a1,a1+η(b1,a1))+mP2Υ1(a1,a1+η(b1,a1))+Γ(m+1)ηm(d1,c1)[Imc+1Ω(c1+η(d1,c1)).Ω1(c1+η(d1,c1))+Im(c1+η(d1,c1))Ω(c1).Ω1(c1)]]. (3.18)

    Proof. Since Ω is an exponential type pre-invex interval-valued function, so we have

    Ω(a1+12η(b1,a1))(e121)[Ω(a1)+Ω(b1)].

    Taking a1=c1+(1τ1)η(d1,c1) and b1=c1+(τ1)η(d1,c1) gives

    Ω(c1+(1τ1)η(d1,c1)+12η(c1+(τ1)η(d1,c1),c1+(1τ1)η(d1,c1)))(e121)[Ω(c1+(1τ1)η(d1,c1))+Ω(c1+(τ1)η(d1,c1))],

    implies

    Ω(c1+12η(d1,c1))(e121)[Ω(c1+(1τ1)η(d1,c1))+Ω(c1+(τ1)η(d1,c1))]. (3.19)

    Similarly

    Ω1(c1+12η(d1,c1))(e121)[Ω1(c1+(1τ1)η(d1,c1))+Ω1(c1+(τ1)η(d1,c1))]. (3.20)

    Multiplying (3.19) and (3.20) gives

    Ω(c1+12η(d1,c1)).Ω1(c1+12η(d1,c1))(e121)2[Ω(c1+(1τ1)η(d1,c1)).Ω1(c1+(1τ1)η(d1,c1))+Ω(c1+(1τ1)η(d1,c1)).Ω1(c1+(τ1)η(d1,c1))+Ω(c1+(τ1)η(d1,c1)).Ω1(c1+(1τ1)η(d1,c1))+Ω(c1+(τ1)η(d1,c1)).Ω1(c1+(τ1)η(d1,c1))]. (3.21)

    Since Ω,Ω1+Λ, are exponential type pre-invex interval-valued functions for τ1[0,1], so we have

    Ω(c1+(1τ1)η(d1,c1)).Ω1(c1+(τ1)η(d1,c1))(e(1τ1)1)2Ω(a1+η(b1,a1)).Ω1(a1)+(eτ11)2Ω(a1).Ω1(a1+η(b1,a1))+(eτ11)(e(1τ1)1)[Ω(a1+η(b1,a1)).Ω1(a1+η(b1,a1))+Ω(a1).Ω1(a1)]. (3.22)

    Similarly

    Ω(c1+(τ1)η(d1,c1)).Ω1(c1+(1τ1)η(d1,c1))(eτ11)2Ω(a1+η(b1,a1)).Ω1(a1)+(e(1τ1)1)2Ω(a1).Ω1(a1+η(b1,a1))+(eτ11)(e(1τ1)1)[Ω(a1+η(b1,a1)).Ω1(a1+η(b1,a1))+Ω(a1).Ω1(a1)]. (3.23)

    Adding (3.22) and (3.23) yields

    Ω(c1+(1τ1)η(d1,c1)).Ω1(c1+(τ1)η(d1,c1))+Ω(c1+(τ1)η(d1,c1)).Ω1(c1+(1τ1)η(d1,c1))[(eτ11)2+(e(1τ1)1)2](Ω(a1+η(b1,a1)).Ω1(a1)+Ω(a1).Ω1(a1+η(b1,a1)))+2(eτ11)(e(1τ1)1)[Ω(a1+η(b1,a1)).Ω1(a1+η(b1,a1))+Ω(a1).Ω1(a1)].

    Now from (3.21), we can write

    Ω(c1+12η(d1,c1)).Ω1(c1+12η(d1,c1))(e121)2[[(eτ11)2+(e(1τ1)1)2]Υ2(a1,a1+η(b1,a1))+2(eτ11)(e(1τ1)1)Υ1(a1,a1+η(b1,a1))+Ω(c1+(1τ1)η(d1,c1)).Ω1(c1+(1τ1)η(d1,c1))+Ω(c1+(τ1)η(d1,c1)).Ω1(c1+(τ1)η(d1,c1))].

    Multiplying by τm11 on both sides and integrating over [0,1] with respect to τ1 yields

    (IR)10τm11Ω(c1+12η(d1,c1)).Ω1(c1+12η(d1,c1))dτ1(e121)2[(IR)10τm11[(eτ11)2+(e(1τ1)1)2]Υ2(a1,a1+η(b1,a1))dτ1+2(IR)10τm11(eτ11)(e(1τ1)1)Υ1(a1,a1+η(b1,a1))dτ1+(IR)10τm11Ω(c1+(1τ1)η(d1,c1)).Ω1(c1+(1τ1)η(d1,c1))dτ1+(IR)10τm11Ω(c1+(τ1)η(d1,c1)).Ω1(c1+(τ1)η(d1,c1))dτ1].

    Thus from (3.12)–(3.15), we get

    Ω(c1+12η(d1,c1)).Ω1(c1+12η(d1,c1))(e121)2[mP1Υ2(a1,a1+η(b1,a1))+mP2Υ1(a1,a1+η(b1,a1))+Γ(m+1)ηm(d1,c1)[Imc+1Ω(c1+η(d1,c1)).Ω1(c1+η(d1,c1))+Im(c1+η(d1,c1))Ω(c1).Ω1(c1)]].

    Corollary 3.3. If Ω(v)=Ω(v), then (3.18) leads to the following fractional inequality for exponential type pre-invex function:

    Ω(c1+12η(d1,c1)).Ω1(c1+12η(d1,c1))(e121)2[mP1Υ2(a1,a1+η(b1,a1))+mP2Υ1(a1,a1+η(b1,a1))+Γ(m+1)ηm(d1,c1)[Imc+1Ω(c1+η(d1,c1)).Ω1(c1+η(d1,c1))+Im(c1+η(d1,c1))Ω(c1).Ω1(c1)]].

    In this section, we establish Hermite-hadamard type inequality in the setting of the He's fractional derivatives introduced in [18].

    Definition 4.1. Let Ω be an L1 function defined on an interval [0,n1]. Then the k1-th He's fractional derivative of Ω(n1) is defined by

    Ik1n1Ω(n1)=1Γ(ik1)didni1n10(τ1n)ik11Ω(τ1)dτ1.

    The interval He's fractional derivative based on left and right end point functions can be defined by

    Ik1n1Ω(n1)=1Γ(ik1)didni1n10(τ1n)ik11Ω(τ1)dτ1=1Γ(ik1)didni1n10(τ1n)ik11[Ω(τ1),Ω(τ1)]dτ1,n>n1,

    where

    Ik1n1Ω(n1)=1Γ(ik1)didni1n10(τ1n)ik11Ω(τ1)dτ1,n>n1 (4.1)

    and

    Ik1n1Ω(n1)=1Γ(ik1)didni1n10(τ1n)ik11Ω(τ1)dτ1,n>n1. (4.2)

    Theorem 4.1. Let Ω:[n1,n2] be an exponential type pre-invex interval-valued function defined on [n1,n2]Λ, where Λ is an open invex set with respect to η:Λ×Λ and Ω:[n1,n2]+c is given by Ω(n)=[Ω(n),Ω(n)] for all n[n1,n2]. If ΩL1([n1,n2],), then

    (1)ik11Ω(n12)(e121)nk1nik12[(1)ik11Ik1(1n)bΩ((1n)b)+Ik1nbΩ(nb)]. (4.3)

    Proof. Let Ω:[n1,n2] be an exponential type pre-invex interval-valued function defined on [n1,n2], then

    Ω(n1+12η(n2,n1))(e121)[Ω(n2+τ1η(n1,n2))+Ω(n1+τ1η(n2,n1))]

    and

    Ω(n1+12η(n2,n1))(e121)[Ω(n2+τ1η(n1,n2))+Ω(n1+τ1η(n2,n1))].

    Taking n2=0,0n1 and multiplying by (τ1n)ik11Γ(ik1), we get

    (τ1n)ik11Γ(ik1)Ω(n12)(e121)(τ1n)ik11Γ(ik1)[Ω((1τ1)n1)+Ω(τ1n1)].

    Integrating with respect to τ1 over [0,n1] gives

    Ω(n12)1Γ(ik1)n10(τ1n)ik11dτ1(e121)Γ(ik1)n10(τ1n)ik11Ω((1τ1)n1)dτ1+(e121)Γ(ik1)n10(τ1n)ik11Ω(τ1n1)dτ1,

    implies

    Ω(n12)(1)ik11nik1Γ(ik1)(e121)Γ(ik1)n10(τ1n)ik11Ω((1τ1)n1)dτ1+(e121)Γ(ik1)n10(τ1n)ik11Ω(τ1n1)dτ1.

    Getting i-th derivative on both sides and using (4.1), we get

    (1)ik11Ω(n12)(e121)nk1nik11[(1)ik11Ik1(1n)bΩ((1n)b)+Ik1nbΩ(nb)].

    Similarly

    (1)ik11Ω(n12)(e121)nk1nik11[(1)ik11Ik1(1n)bΩ((1n)b)+Ik1nbΩ(nb)].

    Thus, we can write

    (1)ik11[Ω(n12),Ω(n12)](e121)nk1nik11[(1)ik11Ik1(1n)b[Ω((1n)b),Ω((1n)b)]+Ik1nb[Ω(nb),Ω(nb)]].

    So,

    (1)ik11Ω(n12)(e121)nk1nik11[(1)ik11Ik1(1n)bΩ((1n)b)+Ik1nbΩ(nb)].

    Corollary 4.1. If Ω(v)=Ω(v), then (4.3) leads to the following fractional inequality for exponential type pre-invex function:

    (1)ik11Ω(n12)(e121)nk1nik11[(1)ik11Ik1(1n)bΩ((1n)b)+Ik1nbΩ(nb)].

    In this paper we studied the interval-valued exponential type pre-invex functions. We established He's and Hermite-Hadamard type inequalities for interval-valued exponential type pre-invex functions in the setting of Riemann-Liouville interval-valued fractional operator.

    This work was sponsored in part by Henan Science and Technology Project of China (No:182102110292).

    The author declares no conflict of interest.



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    11. Maryam Gharamah Ali Alshehri, Abd-Allah Hyder, Hüseyin Budak, Mohamed A. Barakat, Yoshihiro Sawano, Some New Improvements for Fractional Hermite–Hadamard Inequalities by Jensen–Mercer Inequalities, 2024, 2024, 2314-8896, 10.1155/2024/6691058
    12. Zareen A. Khan, Waqar Afzal, Mujahid Abbas, Kwara Nantomah, Ding-Xuan Zhou, Some Novel Inequalities for Godunova–Levin Preinvex Functions via Interval Set Inclusion (⊆) Relation, 2025, 2025, 2314-4629, 10.1155/jom/5570638
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