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Global behavior of solutions to a class of second-order rational difference equations.

机译:一类二阶有理差分方程解的整体行为。

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摘要

For every choice of positive parameters alpha, beta, gamma, A, B and C, consider the two difference equations xn+1=a+bxn+g xn-1Z+Bxn+Cxn-1 ,n=0,1,2,...,x-1,x 0∈&sqbl0;0,infinity&parr0; E1 and xn+1=a+bxn+g xn-1Bxn+Cxn-1 ,n+0,1,2,...,x-1,x 0∈0,infinity, E2;In this thesis, it is shown that all solutions to Eqns.(E1) and (E2) converge to the positive equilibrium or to a prime period-two solution.;A complete qualitative description of the global behavior of solutions to (El) with nonnegative parameters is also given in this thesis whenever prime period-two solutions exist.;Furthermore, a relation is established between local stability of equilibria and slopes of critical curves of planar maps. Then this result is used to give global behavior for nonnegative solutions of the system of difference equations xn+1=b1xn 1+xn+c1yn +h1yn+1=b2 yn1+yn+c2xn +h2n=0,1,&ldots; ,x0,y0 ∈&sqbl0;0,infinity&parr0;x&sqbl0;0,infinity&parr0; with positive parameters. In particular, it is shown that the system has between one and three equilibria, and that the number of equilibria determines global behavior as follows: if there is only one equilibrium, then it is globally asymptotically stable. If there are two equilibria, then one is a local attractor and the other one is nonhyperbolic. If there are three equilibria, then they are linearly ordered in the south-east ordering of the plane, and consist of a local attractor, a saddle point, and another local attractor. In addition, sufficient conditions are given for the system to have a unique equilibrium.
机译:对于正参数alpha,β,γ,A,B和C的每种选择,请考虑两个差分方程xn + 1 = a + bxn + g xn-1Z + Bxn + Cxn-1,n = 0,1,2, ...,x-1,x0∈&sqbl0; 0,infinity&parr0; E1和xn + 1 = a + bxn + g xn-1Bxn + Cxn-1,n + 0,1,2,...,x-1,x0∈0,无穷大,E2;证明了方程(E1)和(E2)的所有解都收敛到正平衡或素数周期二解。;还给出了具有非负参数的(E1)的解的整体性质的完整定性描述。只要存在素数周期为两个的解,就可以得出本论文的结论。此外,还建立了平衡点的局部稳定性与平面图的临界曲线的斜率之间的关系。然后,该结果用于给出差分方程组xn + 1 = b1xn 1 + xn + c1yn + h1yn + 1 = b2 yn1 + yn + c2xn + h2n = 0,1,l的非负解的全局行为。 ,x0,y0∈&sqbl0; 0,infinity&parr0; x&sqbl0; 0,infinity&parr0;具有正参数。特别是,它表明系统具有一到三个平衡点,并且平衡点的数量决定了全局行为,如下所示:如果只有一个平衡点,则它是全局渐近稳定的。如果存在两个均衡,则一个是局部吸引子,另一个是非双曲线的。如果存在三个平衡点,则它们按平面的东南顺序线性排列,并由一个局部吸引子,一个鞍点和另一个局部吸引子组成。另外,给出了足以使系统具有唯一平衡的条件。

著录项

  • 作者

    Basu, Sukanya.;

  • 作者单位

    University of Rhode Island.;

  • 授予单位 University of Rhode Island.;
  • 学科 Mathematics.
  • 学位 Ph.D.
  • 年度 2009
  • 页码 111 p.
  • 总页数 111
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 数学;
  • 关键词

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