Research article

Entropy dimension of shifts of finite type on free groups

  • Received: 08 March 2020 Accepted: 03 June 2020 Published: 12 June 2020
  • MSC : 37A35, 37B10

  • This paper considers the topological degree of G-shifts of finite type for the case where G is a finitely generated free group. Topological degree is the logarithm of entropy dimension; that is, topological degree is a characterization for zero entropy systems. Following the conjugacy-invariance of topological degree, we show that it is equivalent to solving a system of nonlinear recurrence equations. More explicitly, the topological degree of G-shift of finite type is achieved as the maximal spectral radius of a collection of matrices corresponding to the shift itself.

    Citation: Jung-Chao Ban, Chih-Hung Chang. Entropy dimension of shifts of finite type on free groups[J]. AIMS Mathematics, 2020, 5(5): 5121-5139. doi: 10.3934/math.2020329

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  • This paper considers the topological degree of G-shifts of finite type for the case where G is a finitely generated free group. Topological degree is the logarithm of entropy dimension; that is, topological degree is a characterization for zero entropy systems. Following the conjugacy-invariance of topological degree, we show that it is equivalent to solving a system of nonlinear recurrence equations. More explicitly, the topological degree of G-shift of finite type is achieved as the maximal spectral radius of a collection of matrices corresponding to the shift itself.


    Fractional calculus is a popular subject because of having a lot of application areas of theoretical and applied sciences, like engineering, physics, biology, etc. Discrete fractional calculus is more recent area than fractional calculus and it was first defined by Diaz–Osler [1], Miller–Ross [2] and Gray–Zhang [3]. More recently, the theory of discrete fractional calculus have begun to develop rapidly with Goodrich–Peterson [4], Baleanu et al. [5,6], Ahrendt et al. [7], Atici–Eloe [8,9], Anastassiou [10], Abdeljawad et al. [11,12,13,14,15,16], Hein et al. [17] and Cheng et al. [18], Mozyrska [19] and so forth [20,21,22,23,24,25].

    Fractional Sturm–Liouville differential operators have been studied by Bas et al. [26,27], Klimek et al.[28], Dehghan et al. [29]. Besides that, Sturm–Liouville differential and difference operators were studied by [30,31,32,33]. In this study, we define DFHA operators and prove the self–adjointness of DFHA operator, some spectral properties of the operator.

    More recently, Almeida et al. [34] have studied discrete and continuous fractional Sturm–Liouville operators, Bas–Ozarslan [35] have shown the self–adjointness of discrete fractional Sturm–Liouville operators and proved some spectral properties of the problem.

    Sturm–Liouville equation having hydrogen atom potential is defined as follows

    d2Rdr2+ardRdr(+1)r2R+(E+ar)R=0(0<r<).

    In quantum mechanics, the study of the energy levels of the hydrogen atom leads to this equation. Where R is the distance from the mass center to the origin, is a positive integer, a is real number E is energy constant and r is the distance between the nucleus and the electron.

    The hydrogen atom is a two–particle system and it composes of an electron and a proton. Interior motion of two particles around the center of mass corresponds to the movement of a single particle by a reduced mass. The distance between the proton and the electron is identified r and r is given by the orientation of the vector pointing from the proton to the electron. Hydrogen atom equation is defined as Schrödinger equation in spherical coordinates and in consequence of some transformations, this equation is defined as

    y+(λl(l+1)x2+2xq(x))y=0.

    Spectral theory of hydrogen atom equation is studied by [39,40,41]. Besides that, we can observe that hydrogen atom differential equation has series solution as follows ([39], p.268)

    y(x)=a0xl+1{1kl11!(2l+2).2xk+(kl1)(kl2)2!(2l+2)(2l+3)(2xk)2++(1)n(kl1)(kl2)3.2.1(k1)!(2l+2)(2l+3)(2l+n)(2xk)n},k=1,2, (1.1)

    Recently, Bohner and Cuchta [36,37] studied some special integer order discrete functions, like Laguerre, Hermite, Bessel and especially Cuchta mentioned the difficulty in obtaining series solution of discrete special functions in his dissertation ([38], p.100). In this regard, finding series solution of DFHA equations is an open problem and has some difficulties in the current situation. For this reason, we study to obtain solutions of DFHA eq.s in a different way with representation of solutions.

    In this study, we investigate DFHA equation in Riemann–Liouville and Grü nwald–Letnikov sense. The aim of this study is to contribute to the spectral theory of DFHA operator and behaviors of eigenfunctions and also to obtain the solution of DFHA equation.

    We investigate DFHA equation in three different ways;

    i) (nabla left and right) Riemann–Liouville (R–L)sense,

    L1x(t)=μa(bμx(t))+(l(l+1)t22t+q(t))x(t)=λx(t), 0<μ<1,

    ii) (delta left and right) Grünwald–Letnikov (G–L) sense,

    L2x(t)=Δμ(Δμ+x(t))+(l(l+1)t22t+q(t))x(t)=λx(t), 0<μ<1,

    iii) (nabla left) Riemann–Liouville (R–L)sense,

    L3x(t)=μa(μax(t))+(l(l+1)t22t+q(t))x(t)=λx(t), 0<μ<1.

    Definition 2.1. [42] Falling and rising factorial functions are defined as follows respectively

    tα_=Γ(t+1)Γ(tα+1), (2.1)
    t¯α=Γ(t+α)Γ(t), (2.2)

    where Γ is the gamma function, αR.

    Remark 2.1. Delta and nabla operators hold the following properties

    Δtα_=αtα1_,t¯α=αt¯α1. (2.3)

    Definition 2.2. [2,8,11] Nabla fractional sum operators are given as below,

    (i) The left fractional sum of order μ>0 is defined by

    μax(t)=1Γ(μ)ts=a+1(tρ(s))¯μ1x(s), tNa+1, (2.4)

    (ii) The right fractional sum of order μ>0 is defined by

    bμx(t)=1Γ(μ)b1s=t(sρ(t))¯μ1x(s), t b1N, (2.5)

    where ρ(t)=t1 is called backward jump operators, Na={a,a+1,...}, bN={b,b1,...}.

    Definition 2.3. [12,14] Nabla fractional difference operators are as follows,

    (i) The left fractional difference of order μ>0 is defined by

    μax(t)=n(nμ)ax(t)=nΓ(nμ)ts=a+1(tρ(s))¯nμ1x(s), tNa+1, (2.6)

    (ii) The right fractional difference of order μ>0 is defined by

    bμx(t)=(1)nn(nμ)ax(t)=(1)nΔnΓ(nμ)b1s=t(sρ(t))¯nμ1x(s), t b1N. (2.7)

    Fractional differences in (2.62.7) are called the Riemann–Liouville (R–L) definition of the μ-th order nabla fractional difference.

    Definition 2.4. [1,18] Fractional difference operators are given as follows

    (i) The delta left fractional difference of order μ, 0<μ1, is defined by

    Δμx(t)=1hμts=0(1)sμ(μ1)...(μs+1)s!x(ts), t=1,...,N. (2.8)

    (ii) The delta right fractional difference of order μ, 0<μ1, is defined by

    Δμ+x(t)=1hμNts=0(1)sμ(μ1)...(μs+1)s!x(t+s), t=0,..,N1, (2.9)

    fractional differences in (2.82.9) are called the Grünwald–Letnikov (G–L) definition of the μ-th order delta fractional difference.

    Definition 2.5 [14] Integration by parts formula for R–L nabla fractional difference operator is defined by, u is defined on bN and v is defined on Na,

    b1s=a+1u(s)μav(s)=b1s=a+1v(s)bμu(s). (2.10)

    Definition 2.6. [34] Integration by parts formula for G–L delta fractional difference operator is defined by, u, v is defined on {0,1,...,n}, then

    ns=0u(s)Δμv(s)=ns=0v(s)Δμ+u(s). (2.11)

    Definition 2.7. [17] f:NaR, s, Laplace transform is defined as follows,

    La{f}(s)=k=1(1s)k1f(a+k),

    where =C{1} and is called the set of regressive (complex) functions.

    Definition 2.8. [17] Let f,g:NaR, all tNa+1, convolution of f and g is defined as follows

    (fg)(t)=ts=a+1f(tρ(s)+a)g(s),

    where ρ(s) is the backward jump function defined in [42] as

    ρ(s)=s1.

    Theorem 2.1. [17] f,g:NaR, convolution theorem is expressed as follows,

    La{fg}(s)=La{f}La{g}(s).

    Lemma 2.1. [17] f:NaR, the following property is valid,

    La+1{f}(s)=11sLa{f}(s)11sf(a+1).

    Theorem 2.2. [17] f:NaR, 0<μ<1, Laplace transform of nabla fractional difference

    La+1{μaf}(s)=sμLa+1{f}(s)1sμ1sf(a+1),tNa+1.

    Definition 2.9. [17] For |p|<1, α>0, βR and tNa, Mittag–Leffler function is defined by

    Ep,α,β(t,a)=k=0pk(ta)¯αk+βΓ(αk+β+1).

    Theorem 2.3. [17] For |p|<1, α>0, βR, |1s|<1 and |s|α>p, Laplace transform of Mittag–Leffler function is as follows,

    La+1{Ep,α,β(.,a)}(s)=sαβ1sαp.

    Let us consider equations in three different forms;

    i) L1 DFHA operator L1 is defined in (nabla left and right) R–L sense,

    L1x(t)=μa(p(t)bμx(t))+(l(l+1)t22t+q(t))x(t)=λx(t), 0<μ<1, (3.1)

    where l is a positive integer or zero, q(t)+2tl(l+1)t2 are named potential function., λ is the spectral parameter, t[a+1,b1], x(t)l2[a+1,b1], a>0.

    ii) L2 DFHA operator L2 is defined in (delta left and right) G–L sense,

    L2x(t)=Δμ(p(t)Δμ+x(t))+(l(l+1)t22t+q(t))x(t)=λx(t), 0<μ<1, (3.2)

    where p,q,l,λ is as defined above, t[1,n], x(t)l2[0,n].

    iii) L3 DFHA operator L3 is defined in (nabla left) R–L sense,

    L3x(t)=μa(μax(t))+(l(l+1)t22t+q(t))x(t)=λx(t), 0<μ<1, (3.3)

    p,q,l,λ is as defined above, t[a+1,b1], a>0.

    Theorem 3.1. DFHA operator L1 is self–adjoint.

    Proof.

    u(t)L1v(t)=u(t)μa(p(t)bμv(t))+u(t)(l(l+1)t22t+q(t))v(t), (3.4)
    v(t)L1u(t)=v(t)μa(p(t)bμu(t))+v(t)(l(l+1)t22t+q(t))u(t). (3.5)

    Subtracting (1617) from each other

    u(t)L1v(t)v(t)L1u(t)=u(t)μa(p(t)bμv(t))v(t)μa(p(t)bμu(t))

    and applying definite sum operator to both side of the last equality, we have

    b1s=a+1(u(s)L1v(s)v(s)L1u(s))=b1s=a+1u(s)μa(p(s)bμv(s))b1s=a+1v(s)μa(p(s)bμu(s)). (3.6)

    Applying the integration by parts formula (2.10) to right hand side of (18), we have

    b1s=a+1(u(s)L1v(s)v(s)L1u(s))=b1s=a+1p(s)bμv(s)bμu(s)b1s=a+1p(s)bμu(s)bμv(s)=0,
    L1u,v=u,L1v.

    The proof completes.

    Theorem 3.2. Eigenfunctions, corresponding to distinct eigenvalues, of the equation (3.2) are orthogonal.

    Proof. Assume that λα and λβ are two different eigenvalues corresponds to eigenfunctions u(n) and v(n) respectively for the equation (3.1),

    μa(p(t)bμu(t))+(l(l+1)t22t+q(t))u(t)λαu(t)=0,μa(p(t)bμv(t))+(l(l+1)t22t+q(t))v(t)λβv(t)=0,

    Multiplying last two equations to v(n) and u(n) respectively, subtracting from each other and applying sum operator, since the self–adjointness of the operator L1, we get

    (λαλβ)b1s=a+1r(s)u(s)v(s)=0,

    since λαλβ,

    b1s=a+1r(s)u(s)v(s)=0,u(t),v(t)=0,

    and the proof completes.

    Theorem 3.3. All eigenvalues of the equation (3.1) are real.

    Proof. Assume λ=α+iβ, since the self–adjointness of the operator L1, we have

    L1u,u=u,L1u,λu,u=u,λu,
    (λ¯λ)u,u=0

    Since u,ur0,

    λ=¯λ

    and hence β=0. So, the proof is completed.

    Self–adjointness of L2 DFHA operator G–L sense, reality of eigenvalues and orthogonality of eigenfunctions of the equation 3.2 can be proven in a similar way to the Theorem 3.1–3.2–3.3 by means of Definition 2.5.

    Theorem 3.4.

    L3x(t)=μa(μax(t))+(l(l+1)t22t+q(t))x(t)=λx(t),0<μ<1, (3.7)
    x(a+1)=c1,μax(a+1)=c2, (3.8)

    where p(t)>0, r(t)>0, q(t) is defined and real valued, λ is the spectral parameter. The sum representation of solution of the problem (3.7)(3.8) is given as follows,

    x(t)=c1((1+l(l+1)(a+1)22a+1+q(a+1))Eλ,2μ,μ1(t,a)λEλ,2μ,2μ1(t,a))+c2(Eλ,2μ,2μ1(t,a)Eλ,2μ,μ1(t,a))ts=a+1Eλ,2μ,2μ1(tρ(s)+a)(l(l+1)s22s+q(s))x(s). (3.9)

    Proof. Taking Laplace transform of the equation (3.7) by Theorem 2.2 and take (l(l+1)t22t+q(t))x(t)=g(t),

    La+1{μa(μax)}(s)+La+1{g}(s)=λLa+1{x}(s),=sμLa+1{μax}(s)1sμ1sc2=λLa+1{x}(s)La+1{g}(s),=sμ(sμLa+1{x}(s)1sμ1sc1)1sμ1sc2=λLa+1{x}(s)La+1{g}(s),
    =La+1{x}(s)=1sμ1s1s2μλ(sμc1+c2)1s2μλLa+1{g}(s).

    Using Lemma 2.1, we have

    La{x}(s)=c1(sμλs2μλ)1ss2μλ(11sLa{g}(s)11sg(a+1))+c2(1sμs2μλ). (3.10)

    Now, taking inverse Laplace transform of the equation (3.10) and applying convolution theorem, then we have the representation of solution of the problem (3.7)(3.8), |λ|<1, |1s|<1 and |s|α>λ from Theorem 2.3., i.e.

    L1a{sμs2μλ}=Eλ,2μ,μ1(t,a),L1a{1s2μλ}=Eλ,2μ,2μ1(t,a),
    L1a{1s2μλLa{q(s)x(s)}}=ts=a+1Eλ,2μ,2μ1(tρ(s)+a)q(s)x(s).

    Consequently, we have sum representation of solution for DFHA problem 3.7–3.8

    x(t)=c1((1+l(l+1)(a+1)22a+1+q(a+1))Eλ,2μ,μ1(t,a)λEλ,2μ,2μ1(t,a))+c2(Eλ,2μ,2μ1(t,a)Eλ,2μ,μ1(t,a))ts=a+1Eλ,2μ,2μ1(tρ(s)+a)(l(l+1)s22s+q(s))x(s).

    Presume that c1=1,c2=0,a=0 in the representation of solution (3.9) and hence we may observe the behaviors of solutions in following figures (Figures 17) and tables (Tables 13);

    Figure 1.  q(t)=0,λ=0.01,l=1.
    Figure 2.  λ=0.01,μ=0.45,l=1.
    Figure 3.  q(t)=0,μ=0.4,l=1.
    Figure 4.  q(t)=0,l=1,λ=0.01,t=4.
    Figure 5.  q(t)=0,λ=0.01,l=0.01.
    Figure 6.  q(t)=0,λ=0.01,μ=0.9.
    Figure 7.  q(t)=0,μ=0.9,l=0.01.
    Table 1.  q(t)=0,λ=0.01,l=1.
    x(t) μ=0.3 μ=0.35 μ=0.4 μ=0.45 μ=0.5
    x(1) 1 1 1 1 1
    x(2) 0.612 0.714 1.123 0.918 1.020
    x(3) 0.700 0.900 1.515 1.370 1.641
    x(5) 0.881 1.336 2.402 2.747 3.773
    x(7) 1.009 1.740 3.352 4.566 7.031
    x(9) 1.099 2.100 4.332 6.749 11.461
    x(12) 1.190 2.570 5.745 10.623 20.450
    x(15) 1.249 2.975 6.739 15.149 32.472
    x(16) 1.264 3.098 7.235 16.793 37.198
    x(18) 1.289 3.330 8.233 20.279 47.789
    x(20) 1.309 3.544 9.229 24.021 59.967

     | Show Table
    DownLoad: CSV
    Table 2.  λ=0.01,μ=0.45,l=1.
    x(t) q(t)=1 q(t)=t q(t)=t
    x(1) 1 1 1
    x(2) 7.371017 4.411017 5.771017
    x(3) 0.131 0.057 0.088
    x(5) 0.123 0.018 0.049
    x(7) 0.080 0.006 0.021
    x(9) 0.050 0.003 0.011
    x(12) 0.028 0.001 0.005
    x(15) 0.017 0.0008 0.003
    x(16) 0.015 0.0006 0.0006
    x(18) 0.012 0.0005 0.002
    x(20) 0.010 0.0003 0.001

     | Show Table
    DownLoad: CSV
    Table 3.  q(t)=0,μ=0.4,l=1.
    x(t) λ=0.1 λ=0.11 λ=0.12
    x(1) 1 1 1
    x(2) 1 1.025 1.052
    x(3) 1.668 1.751 1.841
    x(5) 3.876 4.216 4.595
    x(7) 7.243 8.107 9.095
    x(9) 11.941 13.707 12.130
    x(12) 22.045 26.197 25.237
    x(15) 36.831 45.198 46.330
    x(16) 43.042 53.369 55.687
    x(18) 57.766 73.092 78.795
    x(20) 76.055 98.154 127.306

     | Show Table
    DownLoad: CSV

    We have analyzed DFHA equation in Riemann–Liouville and Grü nwald–Letnikov sense. Self–adjointness of the DFHA operator is presented and also, we have proved some significant spectral properties for instance, orthogonality of distinct eigenfunctions, reality of eigenvalues. Moreover, we give sum representation of the solutions for DFHA problem and find the solutions of the problem. We have carried out simulation analysis with graphics and tables. The aim of this paper is to contribute to the theory of hydrogen atom fractional difference operator.

    We observe the behaviors of solutions by changing the order of the derivative μ in Figure 1 and Figure 5, by changing the potential function q(t) in Figure 2, we compare solutions under different λ eigenvalues in Figure 3, and Figure 7, also we observe the solutions by changing μ with a specific eigenvalue in Figure 4 and by changing l values in Figure 6.

    We have shown the solutions by changing the order of the derivative μ in Table 1, by changing the potential function q(t) and λ eigenvalues in Table 2, Table 3.

    The authors would like to thank the editor and anonymous reviewers for their careful reading of our manuscript and their many insightful comments and suggestions.

    The authors declare no conflict of interest.



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