The Covid-19 emergency condition is a critical issue for emergency decision support systems. Controlling the spread of Covid-19 in emergency circumstances throughout the global is a difficult task, hence the purpose of this research is to develop a non-linear diophantine fuzzy decision making mechanism for preventing and identifying Covid-19. Fundamentally, the article is divided into three sections in order to establish suitable and correct procedures to meet the circumstances of emergency decision-making. Firstly, we present a non-linear diophantine fuzzy set (non-LDFS), which is the generalisation of Pythagorean fuzzy set, q-rung orthopair fuzzy set, and linear diophantine fuzzy set, and explain their critical features. In addition, algebraic norms for non-LDFSs are constructed based on particular operational rules. In the second section, we use non-LDF averaging and geometric operator to aggregate expert judgements. The last section of this study consists of ranking in which MABAC (multi-attributive border approximation area comparison) method is used to handle the Covid-19 emergency circumstance using non-LDF information. Moreover, based on the presented methods, the numerical case-study of Covid-19 condition is presented as an application for emergency decision-making. The results shows the efficiency of our proposed techniques and give precise emergency strategies to resolve the worldwide ambiguity of Covid-19.
Citation: Sohail Ahmad, Ponam Basharat, Saleem Abdullah, Thongchai Botmart, Anuwat Jirawattanapanit. MABAC under non-linear diophantine fuzzy numbers: A new approach for emergency decision support systems[J]. AIMS Mathematics, 2022, 7(10): 17699-17736. doi: 10.3934/math.2022975
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The Covid-19 emergency condition is a critical issue for emergency decision support systems. Controlling the spread of Covid-19 in emergency circumstances throughout the global is a difficult task, hence the purpose of this research is to develop a non-linear diophantine fuzzy decision making mechanism for preventing and identifying Covid-19. Fundamentally, the article is divided into three sections in order to establish suitable and correct procedures to meet the circumstances of emergency decision-making. Firstly, we present a non-linear diophantine fuzzy set (non-LDFS), which is the generalisation of Pythagorean fuzzy set, q-rung orthopair fuzzy set, and linear diophantine fuzzy set, and explain their critical features. In addition, algebraic norms for non-LDFSs are constructed based on particular operational rules. In the second section, we use non-LDF averaging and geometric operator to aggregate expert judgements. The last section of this study consists of ranking in which MABAC (multi-attributive border approximation area comparison) method is used to handle the Covid-19 emergency circumstance using non-LDF information. Moreover, based on the presented methods, the numerical case-study of Covid-19 condition is presented as an application for emergency decision-making. The results shows the efficiency of our proposed techniques and give precise emergency strategies to resolve the worldwide ambiguity of Covid-19.
It is noted from the literature that many topologies with important applications in mathematics have been defined using new mathematical structures, for example, filter [20], ideal [19] and partially ordered [25]. The grill is one of the classic structures presented by Choquet [11] around 1947, which is a good tool for studying topological notions and has a wide range of important applications in topological theory (see [9,10,30]). Some structures based on both "filter" and "grill" are defined and investigated, as in [22,23], while others are based on "partially ordered set" as [7]. A grill's associated topology has been defined and investigated by Roy and Mukherjee [26]. They presented the basic topological concepts in terms of this new structure and studied the fundamental theorems.
Moreover, some operators have been defined and their properties studied with clarity to determine whether they satisfy Kuratowskis closure axioms (see [27,28,29]). The notion of continuity occupies a great place of study in the wide range of literature [18,24,32].
Császár [12] established the theory of generalizations in 1997 by presenting the notion of generalized open sets. Furthermore, he introduced the generalized topological spaces (breifly GTS) around 2002 [13], which differ from topological spaces in the condition of intersection. In more specific terms, they are closed under arbitrary unions.
In [13,14,31,33], a lot of its characteristics are studied in detail, such as the generalized interior of a set A, the generalized closure of a set A, the generalized neighbourhood, separation axioms, and so on. The notion of continuity gets a lot of attention under the new appellations "generalized continuity", "θ-continuity", "γ-continuity", etc. (see [13,16]). Various kinds of generalized topology appeared and were studied, such as "extremely disconnected generalized topology", "δ- and θ-modifications generalized topology", etc. (see [15,16,33]).
The dual structure of a grill was presented around 2022. It was called "primal". This new structure has a lot of interesting properties, studied in detail by Acharjee et al. [1].
Furthermore, a new topology has been defined by using this new structure, called "primal topology" and some of its topological properties have been investigated. Some articles have appeared that study primal topological spaces in different fields, such as vector spaces induced by metric or soft environments (see [8,21]).
In 1990, [17] different kinds of topological operators were defined based on the structure "ideal". Then, other studies followed the same approach. Al-Omari and Noiri studied some types of operators based on the grill notion (see [4,5,6]). Moreover, [1,3] present types of operators have been defined by using the notion of primal with deep studies of their various properties.
In this paper, our aim is to define a new structure based on both the notions of "primal" and "generalized". This new space will be called "generalized primal topological spaces".
Also, the authors will introduce some operators based on the notion of generalized primal neighbourhood such as cl⋄(A) and Φ(A), with a study of their fundamental characteristics and give an answer to the important question, "do they satisfy Kuratowskis closure axioms?" A lot of nice properties with examples will be present.
Thereafter, we will define a new form of generalized primal topological spaces induced by the previous operators, with a comparison between the structures.
We will go over the fundamental definitions and conclusions in this section. We represent the power set of X≠ϕ by 2X throughout our work.
Definition 2.1. [11] Suppose that X≠ϕ. A collection G⊆X of 2X is named a grill if the next hold:
(i) ϕ∉G.
(ii) For two subsets A and B of X, with A⊆B, we have B∈G, if A∈G.
(iii) For two subsets A and B of X, A∈G or B∈G, if A∪B∈G.
Definition 2.2. [12] Let X≠ϕ. A family g of 2X is named a generalized topology (GT) on X if the next hold:
(i) ϕ∈g.
(ii) The countable union of Gi∈g, for i∈I≠ϕ is belongs to g.
A generalized topological space is the pair (X,g).
Remark 2.1. According to [12], we note that:
(i) This space's elements are identified as g-open and their own complements are identified as g-closed.
(ii) Cg(X) represents the set of all g-closed sets of X.
(iii) cgA represents the closure of A⊆X, which is described as the intersection of all g-closed sets that contain A.
(iv) igA represents the interior of A⊆X, which is described as the union of all g-open sets that contained in A.
(v) cg(cgA)=cgA, ig(igA)=igA and igA⊆A⊆cgA.
(vi) A is g-open if A=igA, A is g-closed if A=cgA and cgA=X∖(ig(X∖A)).
Definition 2.3. [12] In a generalized topological space (X,g). Consider an operator ψ: X→22X satisfies x∈U for U∈ψ(x). Then, U∈ψ(x) is known as a generalized neighbourhood of a point x in the space X, or briefly (GN).
Furthermore, ψ is known as a generalized neighbourhood system on a space X.
Definition 2.4. [12] The collection of all generalized neighbourhood systems on X is denoted by Ψ(X).
Definition 2.5. [1] Suppose that X≠ϕ. A family P of 2X is named a primal on X, when the next hold:
(i) X∉P.
(ii) For A,B⊆X with B⊆A. If A∈P, then B∈P.
(iii) For A,B⊆X, then A∈P or B∈P, whenever A∩B∈P.
Definition 2.6. A primal topological space is defined as the pair (X,τ) with a primal P on X. Moreover, it is represented by (X,τ,P).
Corollary 2.1. [1] Suppose that X≠ϕ. A family P of 2X is named a primal on X, if and only if the next hold:
(i) X∉P.
(ii) For A,B⊆X with B⊆A. If B∉P, then A∉P.
(iii) For A,B⊆X, then A∩B∉P, whenever A∉P and B∉P.
Theorem 2.1. [1] If the collection G forms a grill on X, then the set {A:Ac∈G} is a primal on X.
Theorem 2.2. [1] The union of two primals on X gives a primal on X.
Remark 2.2. According to [1], the intersection of two primals on X need not be a primal on X.
In this part, we establish a new category of generalized topology called "generalized primal topology" and define it as:
Definition 3.1. A generalized primal topology is a generalized topology g with a primal P on X. The triples (X,g,P) denote the generalized primal topological space.
This space's elements are identified as (g,P)-open sets, and their own complement known as (g,P)-closed sets.
C(g,P)(X) denoted the set of all (g,P)-closed sets on X, and cl(g,P)(A) represents the closure of A⊆X, which is described as the intersection of all (g,P)-closed sets that contain A.
Example 3.1. Consider X={a,b,c}, g={ϕ,{a,b},{a,c},X} and the primal set P={ϕ,{a}}. Hence, (X,g,P) is a generalized primal topological space X.
Definition 3.2. In a generalized primal topological space (X,g,P). Consider an operator ψ: X→22X satisfies x∈U for U∈ψ(x). Then, U∈ψ(x) is known as a generalized primal neighbourhood for a point x in the space X.
Remark 3.1. ψ is known as a generalized primal neighbourhood system on a space X. The collection of all generalized primal neighbourhood systems on X is denoted by Ψ(X).
Definition 3.3 In a generalized primal topological space (X,g,P). Consider an operator (.)⋄: 2X→2X defined by
A⋄(X,g,P)={x∈X:Ac∪Uc∈P,∀ U∈ψ(x)}, |
where U is a generalized primal neighbourhood of x∈X.
Remark 3.2. In a generalized primal topological space (X,g,P):
(i) We cannot say that A⋄⊆A, or A⊆A⋄ the following example shows that.
(ii) With an additional condition, the relationship A⋄⊆A is always true, which is proved in the following theorems.
Example 3.2. Consider
X={a,b,c}, g={ϕ,{a},{b},{a,b},X} |
and
P={ϕ,{a},{b},{c},{a,b}}. |
Let A={a,b}. Then, A⋄={c}. Therefore, A⋄⊈A and A⊈A⋄.
Theorem 3.1. Consider (X,g,P) as a generalized primal topological space. Hence, A⋄⊆A, whenever Ac is (g,P)-open.
Proof. Let Ac be (g,P)-open. Let x∈A⋄ with x∉A. Then, Ac is an open generalized primal neighbourhood of x briefly (Ac∈ψ(x)) and Ac∪Uc∈P, for all U∈ψ(x). Hence,
Ac∪(Ac)c=X∈P, |
which is a contradicts with the fact that X∉P. Therefore, A⋄⊆A.
Theorem 3.2. Consider (X,g,P) as a generalized primal topological space. Hence, we have:
(i) ϕ⋄=ϕ.
(ii) A⋄ is (g,P)-closed, for A⊆X, i.e., cl(g,P)(A⋄)=A⋄.
(iii) For A⊆X, (A⋄)⋄⊆A⋄.
(iv) A⋄⊆B⋄, whenever, A⊆B for A,B⊆X.
(v) For A,B⊆X, ⋄A∪B⋄=(A∪B)⋄.
Proof. (i) It is clear that ϕc=X, but X∉P. Thus, we are done.
(ii) Since A⋄⊆cl(g,P)(A⋄) always true. We need to show that cl(g,P)(A⋄)⊆A⋄. Consider x∈cl(g,P)(A⋄) and U∈ψ(x). Thus,
U∩A⋄≠ϕ⇒∃y∈X |
satisfies y∈U∧y∈A⋄. Then, ∀ V∈ψ(y) we have
Vc∪Ac∈P⇒Uc∪Ac∈P. |
Therefore, x∈A⋄. Hence, cl(g,P)(A⋄)⊆A⋄.
(iii) From Theorem 3.1 and (ii) we can conclusion that (A⋄)⋄⊆A⋄, that is A⋄ is (g,P)-closed in X implies (A⋄)c is (g,P)-open.
(iv) Suppose that A⊆B and x∈A⋄. Then, for all U∈ψ(x) we have Ac∪Uc∈P. Hence, Bc∪Uc∈P. Therefore, x∈B⋄.
(v) From (iv) we have A⋄⊆(A∪B)⋄ and B⋄⊆(A∪B)⋄. Then,
A⋄∪B⋄⊆(A∪B)⋄. |
To prove the opposite direction, consider x∉A⋄∪B⋄ implies x∉A⋄ and x∉B⋄. Then, there exists U;V∈ψ(x) satisfies Ac∪Uc∉P and Bc∪Vc∉P. Consider a set W=U∩V, then W∈ψ(x) such that Ac∪Wc∉P and Bc∪Wc∉P. Then,
(A∪B)c∪Wc=(Ac∪Wc)∩(Bc∪Wc)∉P. |
Hence, x∉(A∪B)⋄. Therefore,
(A∪B)⋄⊆A⋄∪B⋄. |
(vi) The proof follows in the same way.
Remark 3.3. In a generalized primal topological space (X,g,P), the opposite inclusion of the Theorem 3.2 (vi) is not always true; the following example shows that.
Example 3.3. Consider
X={a,b,c}, g={ϕ,{a},{b},{a,b},X} |
and
P={ϕ,{a},{b},{c},{a,b}}. |
Let A={a,b} and B={c}. Then,
A⋄={c}=B⋄. |
Thus, A⋄∩B⋄={c} and (A∩B)⋄=ϕ. Therefore,
A⋄∩B⋄⊈(A∩B)⋄. |
Theorem 3.3. Consider (X,g,P) as a generalized primal topological space. Hence, for two subsets A and B of X, A∩B⋄⊆(A∩B)⋄, whenever A is (g,P)-open.
Proof. If A is (g,P)-open and x∈A∩B⋄, then x∈A and x∈B⋄ implies for all
U∈ψ(x):Bc∩Uc∈P. |
Thus,
(A∩B)c∪Uc=Bc∪(A∩U)c∈P. |
Hence, x belongs to (A∩B)⋄. Therefore, we are done.
Theorem 3.4. Consider (X,g,P) as a generalized primal topological space. Suppose C(g,P)(X)∖{X} is a primal on X. Then, for all (g,P)-open sets U, we have U⊆U⋄.
Proof. If U=ϕ, then by Theorem 3.2 (i) we have U⋄=ϕ, hence U⊆U⋄. By hypotheses, if C(g,P)(X)∖{X} is primal, then X⋄=X since Xc=ϕ. From Theorem 3.3, we get
U=U∩X⋄⊆(U∩X)⋄=U⋄, |
∀(g,P)-open set U. Therefore, we are done.
Lemma 3.1. Consider (X,g,P) as a generalized primal topological space. Hence, A⋄=ϕ, whenever Ac⊆X is not a primal.
Proof. Let x∈A⋄. Then, Ac∪Uc∈P for all U∈ψ(x). Since Ac is not primal, we get a contradiction. Therefore, A⋄=ϕ.
Theorem 3.5. Consider (X,g,P) as a generalized primal topological space. Then,
A⋄∖B⋄=(A∖B)⋄∖B⋄, |
for two subsets A and B of X.
Proof. We can represent A⋄ as
A⋄=[(A∖B)∪(A∩B)]⋄. |
From Theorem 3.2 (v), we get
A⋄=(A∖B)⋄∪(A∩B)⋄⊆(A∖B)⋄∪(A⋄∩B⋄). |
This implies
A⋄⊆(A∖B)⋄∪B⋄. |
Thus,
A⋄∖B⋄⊆(A∖B)⋄∖B⋄. |
On the other hand, since (A∖B)⊆A, (A∖B)⋄⊆A⋄ from Theorem 3.2 (iv). Hence,
(A∖B)⋄∖B⋄⊆A⋄∖B⋄. |
Therefore, we are done.
Corollary 3.1. Consider (X,g,P) as a generalized primal topological space. If A,B⊆X and Bc is not a primal, then
(A∪B)⋄=A⋄=(A∖B)⋄. |
Proof. From Lemma 3.1 we get B⋄=ϕ. Thus,
(A∪B)⋄=A⋄∪B⋄=A⋄∪ϕ=A⋄. |
Also, by Theorem 3.5, (A∖B)⋄=A⋄.
Definition 3.4. In a generalized primal topological space (X,g,P). Consider an operator cl⋄: 2X→2X defined by cl⋄(A)=A∪A⋄, for a subset A of X.
Remark 3.4. It is shown by the following theorem that the map cl⋄ is a Kuratowskis closure operator.
Theorem 3.6. Consider (X,g,P) as a generalized primal topological space. Hence, we have:
(i) cl⋄(ϕ)=ϕ.
(ii) For a subset A of X, A⊆cl⋄(A).
(iii) cl⋄(cl⋄(A))=cl⋄(A).
(iv) cl⋄(A)⊆cl⋄(B), whenever A⊆B for A,B⊆X.
(v) For A,B⊆X, cl⋄(A)∪cl⋄(B)=cl⋄(A∪B).
Proof. (i) Since ϕ⋄=ϕ,
cl⋄(ϕ)=ϕ∪ϕ⋄=ϕ. |
(ii) From the definition cl⋄(A)=A∪A⋄, we have A⊆cl⋄(A).
(iii) From (ii) A⊆cl⋄(A) implies
cl⋄(A)⊆cl⋄(cl⋄(A)). |
Conversely, since (A⋄)⋄⊆A⋄ by Theorem 3.2 (iii). Then,
cl⋄(cl⋄(A))=cl⋄(A)∪(cl⋄(A))⋄. |
Thus,
cl⋄(cl⋄(A))=cl⋄(A)∪(A∪A⋄)⋄. |
Hence,
cl⋄(cl⋄(A))=cl⋄(A)∪A⋄∪(A⋄)⋄⊆cl⋄(A)∪A⋄∪A⋄=cl⋄(A). |
Therefore, we are done.
(iv) If A⊆B, then from Theorem 3.2 (iv) we get A⋄⊆B⋄. Hence,
A∪A⋄⊆B∪B⋄ |
implies cl⋄(A)⊆cl⋄(B).
(v) Since
(A∪B)⋄=A⋄∪B⋄ |
is holded and cl⋄(A)=A∪A⋄. Then,
cl⋄(A)∪cl⋄(B)=(A∪A⋄)∪(B∪B⋄). |
Thus,
cl⋄(A)∪cl⋄(B)=(A∪B)∪(A⋄∪B⋄)=cl⋄(A∪B). |
Throughout this section, we will define a new kind of generalized primal topology on X that is stronger than the previous structure that is described in Definition 3.1.
Definition 4.1. In a generalized primal topological space (X,g,P) the collection
g⋄={A⊆X:cl⋄(Ac)=Ac} |
is a generalized primal topology on X induced by an operator cl⋄.
Proposition 4.1. Consider (X,g,P) as a generalized primal topological space. Hence, g is weaker than g⋄.
Proof. Suppose that A∈g. Then, Ac is (g,P)-closed in X implies (Ac)⋄⊆Ac. Hence
cl⋄(Ac)=Ac∪(Ac)⋄⊆Ac. |
But Ac⊆cl⋄(Ac). Then, cl⋄(Ac)=Ac. Therefore, A∈g⋄.
Theorem 4.1. Consider (X,g,P) and (X,g,Q) as two generalized primal topological spaces. If P⊆Q, then g⋄ induced by primal P is finer than g⋄ induced by primal Q.
Proof. Let A∈g⋄ induced by primal Q. Then, Ac∪(Ac)⋄ with respect to Q equal to Ac implies (Ac)⋄ with respect to Q⊆Ac. Let x∉Ac. Then, x∉(Ac)⋄ with respect to Q implies ∃U∈ψ(x) such that
Uc∪(Ac)c=Uc∪A∉Q, |
but P⊆Q. Then, Uc∪A∉P. Hence, x∉(Ac)⋄ with respect to P. Thus, (Ac)⋄ with respect to P ⊆Ac implies
cl⋄(Ac)=Ac∪(Ac)⋄ |
with respect to P equal to Ac. Therefore, A∈g⋄ induced by P.
Theorem 4.2. Consider (X,g,P) as a generalized primal topological space. Hence, A∈g⋄⇔ for all x∈A, ∃U∈ψ(x) satisfies (Uc∪A)∉P.
Proof. Let A∈g⋄. Then,
A∈g⋄⇔cl⋄(Ac)=Ac. |
Thus,
A∈g⋄⇔Ac∪(Ac)⋄=Ac. |
However, (Ac)⋄⊆Ac. Then,
A∈g⋄⇔A⊆((Ac)⋄)c. |
Thus,
A∈g⋄⇔x∉(Ac)⋄, ∀x∈A. |
Therefore,
A∈g⋄⇔Uc∪(Ac)c=Uc∪A∉P, |
for some U∈ψ(x).
Theorem 4.3. For a generalized primal topological space (X,g,P) the collection
BP={G∩P:G∈g and P∉P} |
is a base for g⋄ on X.
Proof. Consider B∈BP. Then, there exists G∈g and P∉P such that B=G∩P. Since g⊆g⋄, then G∈g⋄. Since cl⋄(Pc)=Pc, then P∈g⋄. Hence, B∈g⋄. Consequently, BP⊆g⋄. Let A∈g⋄ and x∈A. Hence, by Theorem 4.2, ∃U∈ψ(x) satisfies Uc∪A∉P. Consider
B=U∩(Uc∪A). |
Then, B∈BP such that x∈B⊆A.
Definition 4.2. In a generalized primal topological space (X,g,P). Consider an operator Φ: 2X→2X identify as
Φ(A)={x∈X: ∃ U∈ψ(x) satisfay (U∖A)c∉P}, |
for A⊆X.
The following theorem defines the relationship between the previously investigated maps (.)⋄ and (Φ).
Theorem 4.4. Consider (X,g,P) as a generalized primal topological space. Hence,
Φ(A)=X∖(X∖A)⋄, |
for a subset A of X.
Proof. Suppose that x∈Φ(A), then ∃U∈ψ(x) such that (U∖A)c∉P. Hence,
(U∩(X∖A))c=(Uc∪A)∉P. |
Thus, x∉(X∖A)⋄ implies
x∈X∖(X∖A)⋄. |
Hence,
Φ(A)⊆X∖(X∖A)⋄. |
Conversely, suppose that
x∈X∖(X∖A)⋄ |
implies x∉(X∖A)⋄. Then, ∃U∈ψ(x) we have
Uc∪(X∖A)c=(U∖A)c∉P. |
Then, x∈Φ(A). Hence,
X∖(X∖A)⋄⊆Φ(A). |
Therefore, we are done.
Corollary 4.1. Consider (X,g,P) as a generalized primal topological space. Hence, Φ(A) is (g,P)-open.
Proof. The proof follows from Theorem 3.2 (ii) and Theorem 4.4.
Remark 4.1. Unlike the map cl⋄, the map Φ does not satisfy the four Kuratowskis closure operator conditions, and this is proven in the following theory.
Theorem 4.5. Consider (X,g,P) as a generalized primal topological space. Hence, the next hold:
(i) Φ(A)⊆Φ(B), whenever A⊆B.
(ii) If U∈g⋄, then U⊆Φ(U).
(iii) Φ(A)⊆Φ(Φ(A)).
(iv) Φ(A)=Φ(Φ(A))⇔(X∖A)⋄=((X∖A)⋄)⋄.
Proof. (i) Let x∈Φ(A). Then, (U∖A)c∉P, but A⊆B. Then, (U∖B)c∉P. Hence, x∈Φ(B). Therefore, Φ(A)⊆Φ(B).
(ii) If U∈g⋄, then
cl⋄(X∖U)=X∖U |
implies
(X∖U)∪(X∖U)⋄=X∖U. |
Then, (X∖U)⋄ subset of X∖U. Hence,
U⊆X∖(X∖U)⋄=Φ(U). |
(iii) Since Φ(A) is (g,P)-open and g⊆g⋄,
Φ(A)∈g⋄⇒Φ(A)⊆Φ(Φ(A)) |
from (ii).
(iv) Let Φ(A)=Φ(Φ(A)). Then
Φ(Φ(A))=Φ(X∖(X∖A)⋄)=X∖(X∖(X∖(X∖A)⋄))⋄. |
Hence, we have
Φ(Φ(A))=X∖((X∖A)⋄)⋄. |
Since Φ(A)=Φ(Φ(A)),
(X∖A)⋄=((X∖A)⋄)⋄. |
Conversely, let
(X∖A)⋄=((X∖A)⋄)⋄. |
From (iii) we get Φ(A)⊆Φ(Φ(A)). Let x∈Φ(Φ(A)). Then, x belongs to X∖((X∖A)⋄)⋄ implies x belongs to X∖(X∖A)⋄. Then, x∈Φ(A). Hence, Φ(Φ(A))⊆Φ(A). Therefore, Φ(A)=Φ(Φ(A)).
Extra properties of the function Φ will be studied in the next theorem.
Theorem 4.6. Consider (X,g,P) as a generalized primal topological space. Hence, the next hold:
(i) Φ(A∩B)=Φ(A)∩Φ(B), for A,B⊆X.
(ii) For A⊆X, Φ(A)=X∖X⋄, whenever Ac∉P.
Proof. (i) It is clear that Φ(A∩B)⊆Φ(A) and Φ(A∩B)⊆Φ(B). Then,
Φ(A∩B)⊆Φ(A)∩Φ(B). |
Conversely, suppose that x∈Φ(A)∩Φ(B). Implies there exists U;V∈ψ(x) satisfies (U∖A)c∉P and (V∖B)c∉P. Consider
W=U∩V∈ψ(x) |
implies (W∖A)c∉P and (W∖B)c∉P. Hence,
(W∖(A∩B))c=(W∖A)c∩(W∖B)c∉P. |
Then, x belongs to Φ(A∩B). Hence,
Φ(A)∩Φ(B)⊆Φ(A∩B). |
(ii) By using Corollary 3.1, we have X⋄=(X∖A)⋄. Hence,
Φ(A)=X∖(X∖A)⋄=X∖X⋄. |
Theorem 4.7. For a generalized primal topological space (X,g,P). Consider the collection
σ={A⊆X:A⊆Φ(A)}, |
thus σ is a generalized primal topology induced by an operator Φ. Moreover, σ=g⋄.
Proof. It is clear that ϕ⊆Φ(ϕ). Then, ϕ∈σ. If
{Aα:α∈Λ}⊆σ, |
then for each α∈Λ we have
Aα⊆Φ(Aα)⊆Φ(⋃α∈ΛAα). |
Hence,
⋃α∈ΛAα⊆Φ(⋃α∈ΛAα). |
Thus, σ is a generalized primal topology on X induced by Φ.
Let U∈g⋄ and x∈U. Then, from Theorem 4.3, there exists V∈ψ(x) and P∉P satisfy
x∈V∩P⊆U. |
Since P⊆(V∖U)c, then (V∖U)c∉P. Hence, x∈Φ(U) implies U∈Φ(U). Therefore, g⋄⊆σ. On the other hand let A∈σ, then A⊆Φ(A) implies
A⊆X∖(X∖A)⋄ |
and
(X∖A)⋄⊆X∖A. |
Thus, X∖A is (g,P)-closed. Then, A∈g⋄. Therefore, σ⊆g⋄.
Coinciding with the great spread of many literatures in various fields important mathematical structures appeared in the theory of topology coinciding with this scientific revolution. For example, the concept of generalized topology appeared, which is based on the concept of "generalized open set" and this space was more generalized than the topological space as the intersection condition was neglected. This space has been extensively studied; much literature has been written about it, and many properties and theories have been studied about it.
In this paper, we have made a new contribution to the field of generalized topology by studying the concept of primal generalized topology, which has a lot of interesting properties. The results obtained in this paper are preliminary. Future research could give more insights by exploring further properties of generalized primal topology. This work opens up the door for possible contributions to this trend by combining primal structures with generalized structures in the theory of generalized topology. If possible, we are looking forward to connecting this notion with some ideas like supra-topology and infra-topology.
The authors declare they have not used artificial intelligence (AI) tools in the creation of this article.
The authors declare no conflicts of interest.
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