Triangular Cubic Hesitant Fuzzy Einstein Hybrid Weighted Averaging Operator and Its Application to Decision Making

: In this paper, triangular cubic hesitant fuzzy Einstein weighted averaging (TCHFEWA) operator, triangular cubic hesitant fuzzy Einstein ordered weighted averaging (TCHFEOWA) operator and triangular cubic hesitant fuzzy Einstein hybrid weighted averaging (TCHFEHWA) operator are proposed. An approach to multiple attribute group decision making with linguistic information is developed based on the TCHFEWA and the TCHFEHWA operators. Furthermore, we establish various properties of these operators and derive the relationship between the proposed operators and the existing aggregation operators. Finally, a numerical example is provided to demonstrate the application of the established approach.


Introduction
Multicriteria decision-making (MCDM) problems seek great attention to practical fields, whose target is to find the best alternative(s) among the feasible options. In primitive times, decisions were framed without handling the uncertainties in the data, which may lead to inadequate results toward the real-life operating situations. Since all these facilitate the uncertainties to a great extent, they cannot withstand situations where the decision the maker has to consider the falsity corresponding to the truth a value ranging over an interval. IFSs have the advantage that permits the user to model some uncertainty on the membership function of the elements. That is, fuzzy sets require a membership degree for each element in the reference set, whereas an IFS permits us to include some hesitation on this value. Atanassov [1] originated the notion of intuitionistic fuzzy set (IFS), which is a generalization of Zadeh's fuzzy sets [2]. The intuitionistic fuzzy set has three main parts: membership function, non-membership function, and hesitancy function. According to Zadeh [3], a conditional statement "If x = A then y =" describes a relation between the two fuzzy variables x and y. He therefore suggests that the conditional statement should be represented by a fuzzy relation from U and V. Bustince et al. [4] analysed the existent relations between the structures of a relation and the structures of its complementary one. Deschrijver et al. [5] introduced the many theories to establish the relationships between intuitionistic fuzzy sets, interval-valued fuzzy numbers are defined. Fahmi et al. [33] developed three arithmetic averaging operators, that is trapezoidal cubic fuzzy Einstein weighted averaging (TrCFEWA) operator, trapezoidal cubic fuzzy Einstein ordered weighted averaging (TrCFEOWA) operator and trapezoidal cubic fuzzy Einstein hybrid weighted averaging (TrCFEHWA) operator, for aggregating trapezoidal cubic fuzzy information. Fahmi et al. [34] defined some Einstein operations on cubic fuzzy set (CFS) and develop three arithmetic averaging operators, which are cubic fuzzy Einstein weighted averaging (CFEWA) operator, cubic fuzzy Einstein ordered weighted averaging (CFEOWA) operator and cubic fuzzy Einstein hybrid weighted averaging (CFEHWA) operator, for aggregating cubic fuzzy data. Amin et al. [35] introduced the new concept of the trapezoidal cubic hesitant fuzzy TOPSIS method.
Despite having a bulk of related literature on the problem under consideration, the following aspects related to triangular cubic hesitant fuzzy numbers (TCHFNs) and their aggregation operators motivated the researchers to carry it an in depth inquiry into the current study.
(1) The main advantages of the proposed operators are these aggregation operators provided more accurate and precious result as compare to the above mention operators.
(2) We generalized the concept of triangular cubic hesitant fuzzy numbers (TCHFNs), triangular intuitionistic fuzzy sets and introduce the concept of triangular cubic hesitant fuzzy numbers. If we take only one element in the membership degree of the triangular cubic hesitant fuzzy number, i.e., instead of the interval we take a fuzzy number, then we get triangular intuitionistic fuzzy numbers, similarly, if we take membership degree as the fuzzy number and non-membership degree equal to zero, then we get triangular fuzzy numbers.
(3) The objective of the study include: Propose triangular cubic hesitant fuzzy number, operational laws, score value and accuracy value of TCHFNs.
Propose three aggregation operators, namely Triangular cubic hesitant fuzzy Einstein weighted averaging operator, Triangular cubic hesitant fuzzy Einstein ordered weighted averaging operator and Triangular cubic hesitant fuzzy Einstein hybrid weighted averaging operator.
Establish MADM program approach based triangular cubic hesitant fuzzy numbers.
Provide illustrative examples of MADM program. (4) In order to testify the application of the developed method, we apply the triangular cubic hesitant fuzzy numbers in the decision making. (5)The initial decision matrix is composed of LVs. In order to fully consider the randomness and ambiguity of the linguistic term, we convert LVs into the triangular cubic hesitant fuzzy numbers, and the decision matrix is transformed into the triangular cubic hesitant fuzzy matrix. (6)The operator can fully express the uncertainty of the qualitative concept and triangular cubic hesitant fuzzy operators can capture the interdependencies among any multiple inputs or attributes by a variable parameter. The aggregation operators can take into account the importance of the attribute weights. Nevertheless, sometimes, for some MAGDM problems, the weights of the attributes are important factors for the decision process.
(7) As we have discussed earlier that Cubic sets are the generalization of intuitionistic hesitant fuzzy sets and a powerful tool to deal with fuzziness. Also, triangular intuitionistic hesitant fuzzy numbers are suitable to deal with fuzziness. However, there may be a situation where the decision maker may provide the degree of membership and nonmembership of a particular attribute in such a way that membership degree is a triangular interval hesitant fuzzy number and non-membership degree is a triangular hesitant fuzzy number. Therefore, to overcome this shortcoming we generalize the concept of triangular intuitionistic hesitant fuzzy numbers and introduce the concept of triangular cubic hesitant fuzzy sets which are very suitable to be used for depicting uncertain or hesitant fuzzy information. If we take only one element in the membership degree of the triangular cubic hesitant fuzzy number, i.e., instead of interval we take a hesitant fuzzy number, then we get triangular intuitionistic hesitant fuzzy numbers, similarly if we take membership degree as hesitant fuzzy number and nonmemberíship degree equal to zero, than we get triangular hesitant fuzzy numbers.
Thus motivating by the idea proposed by Zhao et al. [16], in this paper we first proposed triangular cubic hesitant fuzzy number and including the Triangular cubic hesitant fuzzy Einstein weighted averaging (TCHFEWA) operator, triangular cubic hesitant fuzzy einstein ordered weighted averaging (TCHFEOWA) operator and triangular cubic hesitant fuzzy einstein hybrid weighted averaging (TCHFEHWA) operator.
This paper is organized as follows. In Section 2, we discuss some basic ideas to the fuzzy set and cubic set. In Section 3, we define the triangular cubic hesitant fuzzy numbers (TCHFNs) and operational laws. In Section 4, we present some Einstein operations on triangular cubic hesitant fuzzy numbers (TCHFNs) and analysis some desirable properties of the suggested operations. In Section 5, we first develop some novel arithmetic averaging operators, such as the triangular cubic hesitant fuzzy Einstein weighted averaging (TCHFEWA) operator, triangular cubic hesitant fuzzy Einstein ordered weighted averaging (TCHFEOWA) operator and triangular cubic hesitant fuzzy Einstein hybrid weighted averaging (TCHFEHWA) operator, for aggregating a collection of triangular cubic hesitant fuzzy numbers (TCHFNs). In Section 6, we relate the TCHFEHWA operator to MADM with triangular cubic hesitant fuzzy material. In Section 7, gives an example to illustrate the application of the developed method. In Section 8, we propose the comparison method. In Section 9, we consume a conclusion.

Preliminaries
Definition 1. [2] Let H be a universe of discourse. Then the fuzzy set can be defined as:J = {ḧ, Γ J (ḧ)|ḧ ∈ H}. A fuzzy set in a set H is denoted by Γ J : H → I. The function Γ J (ḧ) denoted the degree of membership of the elementḧ to the set H, where I = [0, 1]. The gathering of all fuzzy subsets of H is denoted by I H . Define a relation on I H as follows: (∀Γ, η ∈ I H )(Γ ≤ η ⇔ (∀ḧ ∈ḧ)(Γ(ḧ) ≤ η(ḧ))).

Definition 2.
[1] Let a set H be fixed, an AIFS A in H is defined as: such that 0 ≤ Γ A ≤ 1, 0 ≤ η A ≤ 1 and 0 ≤ Γ A (ḧ) + η A (ḧ) ≤ 1, for allḧ ∈ H, and they denote the degrees of membership and non-membership of elementḧ ∈ H to set A, respectively. Let π A (ḧ) = 1 − Γ A (ḧ) − η A (ḧ),then it is usually called the intuitionistic fuzzy index of elementḧ ∈ H to set A, representing the degree of indeterminacy or hesitation ofḧ to A. It is obvious that 0 ≤ π A (ḧ) ≤ 1 for everyḧ ∈ H.
[36] Let X be a fixed set, a triangular hesitant fuzzy set defined by

Triangular Cubic Hesitant Fuzzy Number and Operational Laws
Definition 8. Letb be the triangular cubic hesitant fuzzy number on the set of real numbers, its interval-valued triangular hesitant fuzzy set is defined as follows: and its triangular hesitant fuzzy set is andb is called triangular cubic hesitant fuzzy number.
are two triangular cubic hesitant fuzzy numbers (TCHFNs), some operations on triangular cubic hesitant fuzzy numbers (TCHFSs) are defined as follows: (1) be two TCHFNs where T denotes a t-norm and S a so-called t-conorm dual to the t-norm T, defined by S( be an TCHFN and then the score function S(Ä), accuracy function H(Ä), membership uncertainty index T(Ä) and hesitation uncertainty index G(Ä) of an TCHFNÄ are defined by = 1.69. Figure 1 represents the values of the the score function, accuracy function, membership uncertainty index and hesitation uncertainty index of the TCHFNÄ.
Ifω = ( 1 n , 1 n , ..., 1 n ) T . Then the TCHFEWA operator is reduced to triangular cubic fuzzy Einstein averaging operator of dimension n. Which is defined as follows: be a collection of TCHFNs in L TCHFN . Then their aggregated value by using the TCHFEWA operator is also a TCHFN and TCHFEWA(Ä 1 ,Ä 2 , ...,Ä n ) = Then when n = k + 1,we have TCHFEWA (A 1 , A 2 Especially, if w = ( 1 n , 1 n , ...., 1 n ) T , then the TCHFEWA operator is reduced to the triangular cubic hesitant fuzzy Einstein weighing averaging operator, which is shown as follows: 

Triangular Cubic Hesitant Fuzzy Einstein Ordered Weighted Averaging Operator
We also develop a type of triangular cubic fuzzy Einstein ordered weighted averaging (TCFEOWA) operator.

Triangular Cubic Hesitant Fuzzy Einstein Hybrid Weighted Averaging Operator
Deliberate that the TCHFEWA operator weights individual the TCHFNs and the TCHFEOWA operator weights individual the ordered positions of the TCHFNs. In what follows, we elaborate triangular cubic hesitant fuzzy hybrid averaging (TCHFEHWA) operator, which weights together the given TCHFN and its well-ordered position.

An Approach to Multiple Attribute Decision Making with Triangular Cubic Hesitant Fuzzy Information
In this section, we shall utilize the triangular cubic hesitant fuzzy operator to multiple attribute decision making with linguistic information.
There are different factors affecting the chain of command in a program, such as the geographical location of projects, the capability of the engineers, staff, and workers, and the similarity of projects comprising the program. Other factors of much importance in constructing a program are the complexity of the projects, the level of the design, the availability of resources, and the technical know-how. In terms of program organization, delegation is very important to keep a tight control over a large number of projects comprising the program.
Alcantud et al. [37] developed two real implementations: (i) new metarankings of world academic institutions that build on real data from three reputed agencies, and (ii) a new procedure for improving teaching performance assessments which we illustrate with real data collected by ourselves.
Step 5: Calculate all the score values of the alternatives in the form of descending order and select the best alternativeβ i which is the highest degree of the score value.
Next, we shall apply the TCHFEHWA operator to deal with the MADM problem, which involves the following algorithm steps.
Algorithm. A MAGDM approach based on the triangular cubic hesitant fuzzy number Output: The Ranking of all the alternatives Step 1: Define the triangular cubic hesitant fuzzy matrix Step 2: Calculate the normalized triangular cubic hesitant fuzzy decision matrix to obtain the integrated information by aggregating individual information for all DMs.
Step 4: Calculate the scores function based on the (Eq. 4) of each alternativeβ i (i = 1, 2, ..., n), then we have must find out the score value of the aggregate value of each alternative.
Step 5: Rank all the alternatives in the form of descending order and select the best alternativeβ i which is the highest degree of the score value. Figure 2 is a flow chart describing the steps of the algorithm.

Illustrative Example
Regular exposures and disasters are yonder gentleman's controller. Whatever can take the defensive events before its incidence or can ensure less injury by expressing an efficient disaster administration strategy so as to evade loss of humanoid life and additional essential resources is unique. Consider Pakistan where deluges hit numerous conditions and principal to vast loss of life and stuff. Directing on the disaster management, related particularly to four Indian States, taken as alternatives A i , i = 1, 2, 3, viz., (Lahore, Mansehra, and Islamabad) which remained largely devastated during first half of the year 2018, suppose the Administration of Pakistan is trying to make the best decision on allocating reserves to these three conditions. When the whole situation is examined for major areas of fund allocation, it was found that money should be allocated in such a way that three major factors represented by C j , j = 1, 2, 3 namely: "Food Shortage", "Amount of persons saved" and "Absence of substructure Rebuilding amenities" needed to be coped up. Suppose, different factors are prioritized state-wise in accordance with the weight vectorω = (0.25, 0.50, 0.25). Thus, the aim of the problem is to determine the order in which states should be allocated the relief fund.
It ends with a discussion on how to aggregate information that is expressed in terms of linguistic variables. This is a crucial step of the process of decision making, as we need to be able to aggregate the various bits of "linguistic" information (that is expressed in linguistic format) on the issue at hand under the condition of fulfilling certain criteria. The following section then explicates how to model the decision-making process in various succeeding stages. One way to avoid the above problems associated with using membership functions is to use linguistic variables instead of fuzzy numbers, that is, to use variables whose values are not numbers but words or sentences in a natural or artificial language. Since words are in general less precise than numbers, the concept of a linguistic variable serves the purpose of providing a means to approximately characterize phenomena that are complex or ill-defined and hence not amenable to a crisp description in quantitative terms. Of course, in order for linguistic variables to be useful tools of analysis, one ought to be able to manipulate them through various operations. Generally, manipulating linguistic variables can be done in one of two ways. First, one can use linguistic variables by associating membership functions to them and then manipulating the membership functions, since linguistic variables are but a special category of fuzzy sets. Second, one can directly symbolically manipulate the linguistic variables themselves.
In the former case, the manipulation of linguistic variables is done by using the extension principle, which in essence allows the extension of usual algebraic and arithmetic manipulations to fuzzy sets. However, using extended arithmetic operations to handle fuzzy numbers increases the vagueness of results at every step of the calculation, and the shape of the membership functions is not preserved. The final results of this kind of method are fuzzy sets with membership functions that are often hard to interpret, thereby making the corresponding final linguistic variables outside the original set of linguistic terms that one starts from. In the second approach, based on using algebraic operations on the linguistic variables themselves, there is no need to manipulate any sort of membership functions at all. In the following, a summary of the contours of the symbolic approach is presented. The approach is introduced and illustrated by discussing a hypothetical situation in which state leaders have to make choices on how to build a security alignment. This is a fictitious example, hence there is no attempt to justify the posited underlying substantive assumptions for why certain variables are chosen.
The linguistic fuzzy analysis is mathematically rigorous, that is, it is built on a coherent mathematical framework of definitions, theorems, lemmas, and the like. A key idea behind this approach is to directly manipulate the available linguistic information and knowledge. In this pursuit, the first step is to choose the basic ingredients that are used in the symbolic manipulation. This means that the analyst has to choose a context-dependent linguistic term set to describe vague or imprecise information. For example, linguistic terms set for the linguistic variable Importance denoted by H(Importance), can be defined as H(Importance) = {important, not important, very important, not very important, fairly important}. Normally, in any one situation of a decision under multiple criteria, one is faced with a number of linguistic variables, not just one. It is easier to opt for the same linguistic terms set to describe a variation of the various linguistic concepts in the problem at hand, although this is not a requirement. The elements in the set will determine the level of distinction among different parts of the available information, called the granularity of uncertainty. Each value of the linguistic variables is characterized by a syntactic label and a semantic value or meaning. The label is a word or a sentence belonging to the chosen linguistic terms set. The meaning of the label is a fuzzy subset in a universe of discourse (a finite set of words and phrases). The choice of the linguistic terms set with its semantic is thus the first step of any linguistic approach to solving a problem.
Assume that the decision-maker procedures the linguistic terms to the evaluating estimates of the alternatives with reverence to different attributes individually as shown in Table 1. The relationship between the linguistic terms and the comparing TCHFNs in L TCHFN as appeared in Tables 2 and 3. Step 1: Define triangular cubic hesitant fuzzy Decision matrix Tables 2 and 3. ...

D1 =c
Step 3: Utilize the TCHFEHWA operator rating values in Table 6 and get the general rating valuë β ij as displayed in Table 7 to be compared to the alternative ... z i , w = (0.25, 0.50, 0.25). Step 4: Calculate the scores function to aggregate the value of each alternativeβ i (i = 1, 2, ..., n), then we have must to find out the score value of the aggregate value of each alternative.s 1 = 2.2924 9 = 0.2547,s 2 = 3.2564 9 = 0.3618,s 3 = 3.6926 9 = 0.4102.
Step 5: Arrange the scores of all alternatives in the form of descending order and select that alternative which is the highest score function. Sinces 3 >s 2 >s 1 , thus the most wanted alternative iss 3 . Figure 3 is the graph illustrating the three ranking.

Comparison Analysis
In order to verify the validity and effectiveness of the proposed approach, a comparative study is conducted using the methods of interval-valued intuitionistic hesitant fuzzy number [25] and hesitant triangular intuitionistic fuzzy number [23] , which are special cases of TCHFNs, to the same illustrative example.

A Comparison Analysis of the Existing MCDM Interval-Valued Intuitionistic Hesitant Fuzzy Number with Our Proposed Methods
An interval-valued intuitionistic hesitant fuzzy number can be considered as a special case of triangular cubic hesitant fuzzy numbers when there is the only element in membership and non-membership degree [25]. For comparison, the interval-valued intuitionistic hesitant fuzzy number can be transformed to the triangular cubic hesitant fuzzy number (TCHFN) by calculating the average value of the membership and nonmembership degrees. After transformation, the interval-valued intuitionistic hesitant fuzzy number are given in Tables 8 and 9. Step 2: Calculate the score value s 1 = 0.1553, s 2 = −0.0705, s 3 = 0.4855.
Step 3: Rank all the alternatives. According to the ranking of score function S(z i ), the ranking is s 3 > s 1 > s 2 . Figure 4 is the graph illustrating the position of the three scores. The ranking of all alternatives s 3 > s 1 > s 2 and s 3 is the best selection. Obviously, the ranking is derived from the method proposed by Zhang [25], is different from the result of the proposed method. The main reasons are that an interval-valued intuitionistic hesitant fuzzy number only consider the triangular number, membership degrees of an element and nonmembership degrees, which may result in information interval-valued intuitionistic hesitant fuzzy number are not equal.

A Comparison Analysis of the Existing MCDM Hesitant Triangular Intuitionistic Fuzzy Number with Our Proposed Methods
The hesitant triangular intuitionistic fuzzy number can be considered as a special case of triangular cubic hesitant fuzzy numbers when there is the only element in membership and non-membership degree [23]. For comparison, the hesitant triangular intuitionistic fuzzy number can be transformed into the triangular cubic hesitant fuzzy number (TCHFN) by calculating the average value of the membership and nonmembership degrees. After transformation, the hesitant triangular intuitionistic fuzzy number are given in Tables 10 and 11.  Step 2: Calculate the score value s 1 = 0.0165, s 2 = 0.1083, s 3 = −0.0279.
Step 3: Rank all the alternatives. According to the ranking of score function S(z i ), the ranking is s 2 > s 1 > s 3 . Figure 5 is the graph illustrating the position of the three scores. The ranking of all alternatives s 2 > s 1 > s 3 and s 2 is the best selection. Obviously, the ranking is derived from the method proposed by Chen et al. [23] in Table 12, is different from the result of the proposed method. The main reasons are that hesitant triangular intuitionistic fuzzy number only consider the triangular number, membership degrees of an element and nonmembership degrees, which may result in information hesitant triangular intuitionistic fuzzy number are not equal.  The following advantages of our proposal can be summarized on the basis of the above comparison analyses. Triangular cubic hesitant fuzzy number (TCHFN) are very suitable for illustrating uncertain or fuzzy information in MCDM problems because the membership and non-membership degrees can be two sets of several possible values, which cannot be achieved by interval-valued intuitionistic hesitant fuzzy number and intuitionistic triangular hesitant fuzzy number. On the basis of basis operations, aggregation operators and comparison method of triangular cubic hesitant fuzzy number (TCHFN) can be also used to process interval-valued intuitionistic hesitant fuzzy number and intuitionistic triangular hesitant fuzzy number after slight adjustments, because triangular cubic hesitant fuzzy number (TCHFN) can be considered as the generalized form of interval-valued intuitionistic hesitant fuzzy number and intuitionistic triangular hesitant fuzzy number. The defined operations of Triangular cubic hesitant fuzzy number (TCHFN) give us more accurate than the existing operators. This further enhanced the idea of decision making besides the established Q-fuzzy sets [44][45][46] and vague sets [47][48][49].

Conclusions
In this paper, we develop the new idea of triangular cubic hesitant fuzzy number and operational laws. We develop the score function S(A), accuracy function H(A), membership uncertainty index T(A) and hesitation uncertainty index G(A). We develop the Einstein operations on Triangular cubic hesitant fuzzy sets. We develop three arithmetic averaging operators, that are triangular cubic hesitant fuzzy Einstein weighted averaging (TCHFEWA) operator, triangular cubic hesitant fuzzy Einstein ordered weighted averaging (TCHFEOWA) operator and triangular cubic hesitant fuzzy Einstein hybrid weighted averaging (TCHFEHWA) operator, for gathering cubic hesitant fuzzy data. The TCHFEHWA operator simplifies both the TCHFEWA and TCHFEOWA operators. Moreover, we apply the developed aggregation operators to multiple attribute group decision-making with triangular cubic hesitant fuzzy information. We apply on the TCHFEHWA operator to multiple attribute decision making with the triangular cubic hesitant fuzzy material. Finally, a numerical example is used to illustrate the validity of the proposed approach in group decision-making problems. The advantages of this new method are that: (1) it is more reliable and reasonable to aggregate the Einstein information under the triangular cubic hesitant fuzzy numbers environment; (2) it offers an effective and powerful mathematics tool for the MADM under uncertainty and can provide more reliable and flexible aggregation results in decision making; (3) it not only considers relationships between the input arguments or the attributes, but also takes into account the correlation between input argument and itself or the interrelations between the attribute and itself, furthermore, interrelationships between input arguments or the attributes are tackled once. The new methods provide some reasonable and reliable MADM aggregation operators, which broaden the selection scope of the decision makers and offer theory Einstein for the MADM methods. In group decision-making problems, because the experts usually come from different speciality fields and have different backgrounds and levels of knowledge, they usually have diverging opinions. Thus, in future work, we will present a consensus model for group decision-making with trapezoidal cubic linguistic neutrosophic hesitant fuzzy information.