NUK - logo
E-viri
Celotno besedilo
Recenzirano
  • Codimension one and two bif...
    Abdelaziz, Mahmoud A.M.; Ismail, Ahmad Izani; Abdullah, Farah A.; Mohd, Mohd Hafiz

    Chaos, solitons and fractals, November 2020, 2020-11-00, Letnik: 140
    Journal Article

    •We provide a discrete-time fractional-order SEIR measles epidemic model with vaccination.•The existence of steady states and the asymptotic stability of the steady states are discussed.•The occurrence of flip bifurcation, Neimark-Sacker bifurcation and codim 2 flip-Neimark-Sacker bifurcation are captured using an algebraic criterion method.•Theoretical results are validated numerically. In this paper, a discrete-time SEIR measles epidemic model with fractional-order and constant vaccination is investigated. The basic reproduction number with an algebraic criterion are used to study the local asymptotic stability of the equilibrium points. Two types of codimension one bifurcation namely, flip and Neimark-Sacker (N-S) bifurcations and their intersection codimension two flip-N-S bifurcation, are discussed. The necessary and sufficient conditions for detecting these types of bifurcation are derived using algebraic criterion methods. The criterions employed are based on the coefficients of characteristic equations rather than the properties of eigenvalues of Jacobian matrix. The output is a semi-algebraic system composed of a set of equations, inequalities and inequations. These criterions represent appropriate conditions for codim-1 and codim-2 bifurcations of high dimensional maps.