Research article Special Issues

Transient prophylaxis and multiple epidemic waves

  • Public opinion and opinion dynamics can have a strong effect on the transmission rate of an infectious disease for which there is no vaccine. The coupling of disease and opinion dynamics however, creates a dynamical system that is complex and poorly understood. We present a simple model in which susceptible groups adopt or give up prophylactic behaviour in accordance with the influence related to pro- and con-prophylactic communication. This influence varies with disease prevalence. We observe how the speed of the opinion dynamics affects the total size and peak size of the epidemic. We find that more reactive populations will experience a lower peak epidemic size, but possibly a larger final size and more epidemic waves, and that an increase in polarization results in a larger epidemic.

    Citation: Rebecca C. Tyson, Noah D. Marshall, Bert O. Baumgaertner. Transient prophylaxis and multiple epidemic waves[J]. AIMS Mathematics, 2022, 7(4): 5616-5633. doi: 10.3934/math.2022311

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  • Public opinion and opinion dynamics can have a strong effect on the transmission rate of an infectious disease for which there is no vaccine. The coupling of disease and opinion dynamics however, creates a dynamical system that is complex and poorly understood. We present a simple model in which susceptible groups adopt or give up prophylactic behaviour in accordance with the influence related to pro- and con-prophylactic communication. This influence varies with disease prevalence. We observe how the speed of the opinion dynamics affects the total size and peak size of the epidemic. We find that more reactive populations will experience a lower peak epidemic size, but possibly a larger final size and more epidemic waves, and that an increase in polarization results in a larger epidemic.



    Rough set theory, introduced by Pawlak [17], is a powerful mathematical tool for effectively transacting with imprecise and uncertain information. A key advantage of rough set theory is its ability to represent data using granular computing inspired by an equivalence relation. As we know, the granular computing represented by equivalence classes in the original model of Pawlak has been updated using some neighborhood systems inspired by relations weaker than equivalence relation or arbitrary relations; for more details about these neighborhood systems, we refer the readers to [6,14,22] and references mentioned therein. This development assists in canceling a strict condition of an equivalence relation and expanding the scope of its applications in diverse disciplines.

    The interconnection of topological and rough set theory was first put forward by Wiweger [21], who explored the topological aspects of rough sets. This led to a fusion of rough set theory and topological structures becoming a central focus of numerous studies [19,25]. Then, some techniques to institute a topology using rough neighborhoods were proposed to represent rough approximation operators and analyze information systems; see [1,13]. One of the important topological tools to reduce the vagueness of knowledge is nearly open sets, so many authors applied to describe rough set models, such as δβ-open sets [2], somewhat open sets [3], and somewhere dense sets [4]. Quite recently, this interaction has been developed to involve generalizations of topology, such as supra topology [5], infra topology [7], minimal structures [9], and bitopology [18]. It is worth noting that several manuscripts investigated rough set models from different views as [8,20].

    In 2013, Kandi et al. [12] integrated the abstract principle so-called ideal I with rough neighborhoods to provide a new framework of rough sets paradigms called ideal approximation spaces. As illustrated in published literature like [10,15,24], this framework proves its capability in terms of enlarging the domain of confirmed knowledge and thereby maximizing the value of accuracy.

    In 2022, Nawar et al. [16] proposed two new rough set models, the first one generated by one of nearly open sets, namely, θβσ-open sets, and the second generated by ideals and I-θβσ-open sets. However, we note that they provided some incorrect results and relationships that cannot be overlooked and require correction, particularly those that compare the superiority of their approach over the one introduced by Hosny [11]. In this regard, we construct a counterexample to show that Theorem 4.1, Corollary 4.1, and items (2) and (4) of Corollary 4.2 displayed in [16] are false. Moreover, we prove that their approach and Hosny's approach [11] are incomparable. Ultimately, we evidence that three observations on page 2494 of [11] about the given application are incorrect, in general.

    Here, we recall some definitions and results that are required to understand this work.

    Remember that a relation λ on a nonempty set X is a subset of X×X. We write aλb when (a,b)λ.

    Definition 2.1 [17] Let λ be an equivalence relation on X. The lower approximation and upper approximation of ZX are, respectively, given by:

    λ_(Z)={VX/λVZ}.
    ¯λ(Z)={VX/λVZ},

    where X/λ denotes the family of equivalence classes induced by λ.

    The triple (X,λ_,¯λ) is called Pawlak rough set models; it is known as the original (standard) model. The core features of this model are enumerated in the subsequent proposition.

    Proposition 2.2. [17] Consider an equivalence relation λ defined on X. For sets V,W, the next characteristics hold:

    (L1)λ_(V)V(U1)S¯λ(V)(L2)λ_()=(U2)¯λ()=(L3)λ_(X)=X(U3)¯λ(X)=X(L4)IfVW,thenλ_(V)λ_(W)(U4)IfVW,then¯λ(V)¯λ(W)(L5)λ_(VW)=λ_(V)λ_(W)(U5)¯λ(VW)¯λ(V)¯λ(W)(L6)λ_(S)λ_(W)λ_(VW)(U6)¯λ(VW)=¯λ(V)¯λ(W)(L7)λ_(Vc)=(¯λ(V))c(U7)¯λ(Vc)=(λ_(V))c(L8)λ_(λ_(V))=λ_(V)(U8)¯λ(¯λ(V))=¯λ(V)(L9)λ_((λ_(V))c)=(¯λ(V))c(U9)¯λ((¯λ(V))c)=(λ_(V))c(L10)λ_(W)=W,WX/λ(U10)¯λ(W)=W,WX/λ

    In many positions, the equivalence relations are not attainable. Consequently, the classical approach has been extended by employing weaker relations than full equivalence. This led to the proposal of different types of neighborhoods as granular computing alternatives for the equivalence classes.

    Definition 2.3 [1,22,23] Consider an arbitrary relation λ on X. If σ{r,r,l,l,i,i,u,u}, then the σ-neighborhoods of aX, symbolized by Nσ(a), are identified as:

    (i) Nr(a)={bX:a λ b}.

    (ii) Nl(a)={bX:b λ a}.

    (iii)

    Nr(a)={aNr(b)Nr(b):Nr(b)involvinga:Elsewise

    (iv)

    Nl(a)={aNl(b)Nl(b):Nl(b)involvinga:Elsewise

    (v) Ni(a)=Nr(a)Nl(a).

    (vi) Nu(a)=Nr(a)Nl(a).

    (vii) Ni(a)=Nr(a)Nl(a).

    (viii) Nu(a)=Nr(a)Nl(a).

    Henceforward, unless otherwise specified, we will consider σ to belong to the set {r,r,l,l,i,i,u,u}.

    Remark 2.4. The authors of [16] incorrectly mentioned the definitions of Nr(a) and Nl(a). They overlooked the cases that do not exist Nr(b) containing a and Nl(b) containing a, which leads to incorrect computations for some cases, especially when the given binary relation is not serial or inverse serial. Therefore, we should consider these cases when we define Nr(a) and Nl(a) as given in (iii) and (iv) of Definition 2.3.

    Definition 2.5. [1] Consider a relation λ on X and let ζσ denote a mapping from X to 2X, associating each member aX with its σ-neighborhood in 2X. Consequently, the triple (X,λ,ζσ) is termed a σ-neighborhood space, abbreviated as σ-NS.

    Theorem 2.6. [1] It may generate a topology ϑσ on X using Nσ-neighborhoods by the next formula

    ϑσ={VX:Nσ(a)Vfor eachaV}

    The main concepts of rough set paradigms inspired by a topology given in Theorem 2.6 are mentioned in the next two definitions.

    Definition 2.7. [1] Let (X,λ,ζσ) be a σ-NS and ϑσ be a topology described in Theorem 2.6. For each σ, the σ-lower and σ-upper, σ-boundary, and σ-accuracy of a subset Z of X are, respectively, defined by the following formulas.

    (ⅰ) H_σ(Z)={Vϑσ:VZ}=intσ(Z), where intσ(Z) is the interior points of Z in (X,ϑσ).

    (ⅱ) ¯Hσ(Z)={W:ZW and Wcϑσ}=clσ(Z), where clσ(Z) is the closure points of Z in (X,ϑσ).

    (ⅲ) Bσ(Z)=¯Hσ(Z)H_σ(Z)

    (ⅳ) Aσ(Z)=H_σ(Z)¯Hσ(Z), where Z is a nonempty set.

    Definition 2.8. [1] A subset Z of (X,λ,ζσ) is called an σ-exact (resp., σ-rough) set if H_σ(Z)=¯Hσ(Z) (resp., H_σ(Z)¯Hσ(Z))

    Definition 2.9. A nonempty subclass I of 2X is called an ideal on X provided that the next conditions are satisfied.

    (ⅰ) The union of any two members in I is a member of I.

    (ii) If VI, then any subset of V is a member of I.

    Theorem 2.10. [11,12] It may generate a topology ϑIσ on X using Nσ-neighborhoods and an ideal I by the next formula

    ϑIσ={VX:Nσ(a)VIfor eachaV}

    The main concepts of rough set paradigms inspired by a topology given in Theorem 2.10 are mentioned in the next two definitions.

    Definition 2.11. [11] Let (X,λ,ζσ) be a σ-NS, I be an ideal on X, and ϑIσ be a topology described in Theorem 2.10. For each σ, the Iσ-lower and Iσ-upper, Iσ-boundary, and Iσ-accuracy of a subset Z of X are, respectively, defined by the following formulas.

    (ⅰ) H_Iσ(Z)={VϑIσ:VZ}=intIσ(Z), where intIσ(Z) is the interior points of Z in (X,ϑIσ).

    (ⅱ) ¯HIσ(Z)={W:ZW and WcϑIσ}=clIσ(Z), where clIσ(Z) is the closure points of Z in (X,ϑIσ).

    (ⅲ) BIσ(Z)=¯HIσ(Z)H_Iσ(Z)

    (ⅳ) AIσ(Z)=H_Iσ(Z)¯HIσ(Z), where Z is a nonempty set.

    Definition 2.12. [11] Let (X,λ,ζσ) be a σ-NS and I be an ideal on X. A subset Z of X is called an Iσ-exact (resp., Iσ-rough) set if H_Iσ(Z)=¯HIσ(Z) (resp., H_Iσ(Z)¯HIσ(Z)).

    This section rectifies some invalid claims and relationships presented in [16]. An elucidative example is provided to support the amendments that were made.

    To begin, we recall the definition of I-θβσ-open sets as introduced in [16].

    Definition 3.1. [16] Let (X,λ,ζσ) be a σ-NS and I be an ideal on X. Then, a subset of V of X is called I-θβσ-open if Vclσ(intσ(clθσ(V))) such that

    clθσ(V)=VVθσwhereVθσ={aX:Vclσ(G)IforeveryGϑσcontaininga}.

    The complement of an I-θβσ-open set is named I-θβσ-closed. The classes of I-θβσ-open subsets and I-θβσ-closed subsets are respectively symbolized by I-θβσO(X) and I-θβσC(X).

    Then, they introduced the ideas of lower and upper approximations, boundary regions, and accuracy measures in relation to the classes of I-θβσO(X) and I-θβσC(X) as follows.

    Definition 3.2. [16] Let (X,λ,ζσ) be a σ-NS and I be an ideal on X. For each σ, the I-θβσ-lower and I-θβσ-upper, I-θβσ-boundary, and I-θβσ-accuracy of a subset Z of X are, respectively, defined by the following formulas.

    (ⅰ) H_Iθβσ(Z)={VI-θβσO(X):VZ}=intIθβσ(Z), where intIθβσ(Z) is the interior points of Z in (X,I-θβσO(X)).

    (ⅱ) ¯HIθβσ(Z)={WI-θβσC(X):ZW}=clIθβσ(Z), where clIθβσ(Z) is the closure points of Z in (X,I-θβσO(X)).

    (ⅲ) BIθβσ(H)=¯HIθβσσ(Z)H_Iθβσσ(Z)

    (ⅳ) AIθβσ(Z)=H_Iθβσσ(Z)¯HIθβσσ(Z), where Z is a nonempty set.

    Remark 3.3. One can prove that the structure (X,I-θβσO(X)) is closed under arbitrary unions. In contrast, the intersection of two I-θβσ-open sets fails to be an I-θβσ-open set, in general. Therefore, (X,I-θβσO(X)) forms a supra topology on X.

    Definition 3.4. [16] Let (X,λ,ζσ) be a σ-NS and I be an ideal on X. A subset Z of X is called an I-θβσ-exact (resp., I-θβσ-rough) set if H_Iθβσ(Z)=¯HIθβσ(Z) (resp., H_Iθβσ(Z)¯HIθβσ(Z))

    The authors of [16] claimed the following theorem and two corollaries; they were presented in [16] in the following order: Theorem 4.1, Corollary 4.1, and items (2) and (4) of Corollary 4.2.

    Theorem 3.5. [16] Let (X,λ,ζσ) be a σ-NS and I be an ideal on X. Then, we have the following properties for any subset Z of X.

    (ⅰ) H_σ(Z)H_Iσ(Z)H_Iθβσ(Z).

    (ⅱ) ¯HIθβσ(Z)¯HIσ(Z)¯Hσ(Z).

    Corollary 3.6. [16] Let (X,λ,ζσ) be a σ-NS and I be an ideal on X. Then, we have the following properties for any subset Z of X.

    (ⅰ) BIθβσ(Z)BIσ(Z)Bσ(Z).

    (ⅱ) Aσ(Z)AIσ(Z)AIθβσ(Z).

    Corollary 3.7. [16] Let (X,λ,ζσ) be a σ-NS and I be an ideal on X. Then,

    (ⅰ) Every I-σ-exact set is I-θβσ-exact.

    (ⅱ) Every I-θβσ-rough set is I-σ-rough.

    We give the subsequent counterexample to show that Theorem 3.5 is incorrect in general.

    Example 3.8. Let λ={(a,a),(b,b),(c,c),(a,b),(b,a),(x,a),(x,b),(x,c)} be a binary relation on X={a,b,c,x} and I={,{a},{b},{a,b}} be an ideal on X. Then, the r-neighborhoods of elements of X are Nr(a)=Nr(b)={a,b}, Nr(c)={c}, and Nr(x)={a,b,c}. Accordingly, we compute the following classes:

    (ⅰ) ϑr={,X,{c},{a,b},{a,b,c}},

    (ⅱ) ϑIr=ϑr{{a},{b},{a,c},{b,c},{c,x},{a,c,x},{b,c,x}}, and

    (ⅲ) I-θβrO(X)=ϑr{{x},{a,x},{b,x},{c,x},{a,b,x},{a,c,x},{b,c,x}}.

    Now, we calculate the lower and upper approximations inspired by the classes of ϑIr and I-θβrO(X) in Table 1.

    Table 1.  Lower and upper approximations in relation to the methods of Hosny [11] and Nawar et al. [16].
    Methods Hosny method ϑIr [11] Nawar et al. method I-θβrC(X) [16]
    ZX H_Ir(Z) ¯HIr(Z) H_Iθβr(Z) ¯HIθβr(Z)
    {a} {a} {a} {a}
    {b} {b} {b} {b}
    {c} {c} {c,x} {c} {c}
    {x} {x} {x} {x}
    {a,b} {a,b} {a,b} {a,b} {a,b}
    {a,c} {a,c} {a,c,x} {c} {a,c}
    {a,x} {a} {a,x} {a,x} {a,b,x}
    {b,c} {b,c} {b,c,x} {c} {b,c}
    {b,x} {b} {b,x} {b,x} {a,b,x}
    {c,x} {c,x} {c,x} {c,x} {c,x}
    {a,b,c} {a,b,c} X {a,b,c} {a,b,c}
    {a,b,x} {a,b} {a,b,x} {a,b,x} {a,b,x}
    {a,c,x} {a,c,x} {a,c,x} {a,c,x} X
    {b,c,x} {b,c,x} {b,c,x} {b,c,x} X

     | Show Table
    DownLoad: CSV

    On the one hand, one can see from Table 1 that H_Iθβr({a,c})={c}H_Ir({a,c})={a,c} and ¯HIr({a,c,x})={a,c,x}¯HIθβr({a,c,x})=X. Therefore, there exist subsets V,W such that H_Ir(V)H_Iθβr(V) and ¯HIθβr(W)¯HIr(W), which revokes the claims of Theorem 3.5. On the other hand, H_Ir({b,x})={b}H_Iθβr({b,x})={b,x} and ¯HIθβr({a,c})={a,c}¯HIr({a,c})={a,c,x}.

    This implies that the rough approximation operators generated by the methods introduced in [11] and [16] are independent of each other. Hence, the claims given in Theorem 3.5 are false.

    Accordingly, one can note that Corollary 4.2 of [16] (mentioned here as Corollary 3.7) is also wrong. To confirm this matter, take a subset V={a}. By Table 1, we find that H_Ir(V)=¯HIr(V)=V, so V is I-r-exact. However, H_Iθβr(V)=H_Iθβr(V)={a}, so V is not I-θβr-exact. Equivalently, V is I-θβr-rough but not I-r-rough.

    Consequently, Corollary 4.1 of [16] (mentioned here as Corollary 3.6) is false. To illustrate this conclusion, we provide Table 2 which is based on the computations of Table 1.

    Table 2.  Boundary region and accuracy in relation to the methods of Hosny [11] and Nawar et al. [16].
    Methods Hosny method ϑIr [11] Nawar et al. method I-θβrC(X) [16]
    ZX BIr(Z) AIr(Z) BIθβr(Z) AIθβr(Z)
    {a} 1 {a} 0
    {b} 1 {b} 0
    {c} {x} 12 1
    {x} {x} 0 1
    {a,b} 1 1
    {a,c} {x} 23 {c} 12
    {a,x} {x} 12 {b} 23
    {b,c} {x} 23 {b} 12
    {b,x} {x} 12 {a} 23
    {c,x} 1 1
    {a,b,c} {x} 34 1
    {a,b,x} {x} 23 1
    {a,c,x} 1 {b} 34
    {b,c,x} 1 {a} 34

     | Show Table
    DownLoad: CSV

    On the one hand, one can see from Table 2 that BIr({a})=BIθβr({a})={a} and AIθβr({a})=0<AIr({a})=1. Therefore, there exist subsets V,W such that BIθβr(V)BIr(V) and AIr(W)AIθβr(W), which revokes the claims of Corollary 3.6. On the other hand, BIθβr({c})=BIr({c})={x} and AIr({c})=0<AIθβr({c})=12.

    This implies that the boundary regions and accuracy induced by the methods introduced in [11] and [16] are independent of each other. Hence, the claims given in Corollary 3.6 need not be true, in general.

    Now, we put forward the correct relationships between the notions presented in Theorem 3.5 and Corollaries 3.6 and 3.7 in the following remark.

    Remark 3.9. Let (X,λ,ζσ) be a σ-NS and I be an ideal on X. Then, there is no relationship between the following concepts inspired by the approaches of [11] and [16].

    (ⅰ) The lower approximations H_Iσ and H_Iθβσ.

    (ⅱ) The upper approximations ¯HIσ and ¯HIθβσ.

    (ⅲ) The boundary regions BIσ and BIθβσ.

    (ⅳ) The accuracy measures AIσ and AIθβσ.

    (ⅴ) I-σ-exact and I-θβσ-exact (I-σ-rough and I-θβσ-rough) sets.

    In Figure 1, three observations were mentioned on page 2494 of [16] concerning the suggested application.

    Figure 1.  Observations given on page 2494 of [16].

    In what follows, we show that these observations are incorrect or inaccurate.

    (ⅰ) The first and second items are not true since the approach of [16] is not the finest one. It is not stronger than the approach proposed by Hosny [11] as we illustrated in the aforementioned discussion. The appropriate description is that the methods of [11] and [16] are incomparable.

    (ⅱ) The third item is inaccurate since the approach of [16] does not preserve all properties of the standard model of Pawlak (we mentioned these properties in Proposition 2.2) since it can be noted that the properties L5 and U6 are not satisfied. To confirm this point, take subsets V={a,b}, W={a,x}, Y={a}, and Z={x}. Then, H_Iθβσ(V)=V and H_Iθβσ(W)=W, whereas H_Iθβσ(VW)= is a proper subset of H_Iθβσ(V)H_Iθβσ(W). Also, ¯HIθβσ(YZ)={a,b,x}, whereas ¯HIθβσ(Y)¯HIθβσ(Z)={a,x} is a proper subset of ¯HIθβσ(YZ). This means that rough set models provided in [16] violate some properties of the standard model of Pawlak, which disproves the third observation of Figure 1.

    In this note, we have showed invalid results and relationships introduced in [16]. With the help of an illustrative example, we have demonstrated that Theorem 4.1, Corollary 4.1, and items (2) and (4) of Corollary 4.2 given in [16] are incorrect. Also, we have concluded that the rough set paradigms proposed by Hosny [11] and Nawar et al. [16] are independent of each other; that is, they are incomparable. Then, we pointed out the concrete relationships between these rough set models. Finally, we have elucidated that three observations on page 2494 of [16] about the given application are false, as well as emphasized that there is no preponderance for Nawar et al.'s approach [16] over Hosny's approach [11] and vice versa in terms of improving the approximation operators and reducing the size of uncertainty.

    Tareq M. Al-shami: Conceptualization, Methodology, Validation, Formal analysis, Investigation, Writing-original draft, Writing-review and editing, Supervision. Mohammed M. Ali Al-Shamiri: Validation, Formal analysis, Investigation, Funding acquisition. Murad Arar: Validation, Formal analysis, Investigation, Funding acquisition. All authors have read and agreed to the published version of the manuscript.

    The authors extend their appreciation to the Deanship of Research and Graduate Studies at King Khalid University for funding this work through Large Research Project under grant number RGP2/302/45.

    The authors declare that they have no competing interests.



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