Date of Award
2010
Degree Type
Dissertation
Degree Name
Doctor of Philosophy in Mathematics
Department
Mathematics
First Advisor
Mustafa Kulenovic
Abstract
In my first manuscript, I investigate the global stability character of the equilibrium points and the period-two solutions of [special characters omitted] with positive parameters and nonnegative initial conditions. I show that every solution of the equation in the title converges to either the zero equilibrium, the positive equilibrium or the period-two solution, for all values of parameters outside of a specific set defined in the paper. In the case when the equilibrium points and period-two solution coexist I give a precise description of the basins of attraction of all points. My results give an affirmative answer to Conjecture 9.5.6 and the complete answer to Open Problem 9.5.7 from [1]. In my second manuscript, I prove fixed point theorems for monotone mappings in partially ordered complete metric spaces which satisfy a weaker contraction condition for all points that are related by a given ordering. I also give a global attractivity result for all solutions of the difference equation[special characters omitted] where F satisfies certain monotonicity conditions with respect to the given ordering. In my third manuscript, I investigate the global dynamics of solutions of two distinct competitive rational systems of difference equations in the plane. I show that the basins of attraction of different locally asymptotically stable equilibrium points are separated by the global stable manifolds of either saddle points or of non-hyperbolic equilibrium points. My results give the complete answer to Open Problem 1 posed recently in [2]. [1] M. R. S. Kulenović and G. Ladas, Dynamics of Second Order Rational Difference Equations, with Open Problems and Conjectures, Chapman and Hall/CRC Press, 2001. [2] E. Camouzis, M. R. S. Kulenović, G. Ladas and O. Merino, Rational Systems in the Plane - Open Problems and Conjectures, J. Differ. Equations Appl., 15(2009), 303-323.
Recommended Citation
Brett, Ann M., "Global behavior of difference equations" (2010). Open Access Dissertations. Paper 2368.
https://digitalcommons.uri.edu/oa_diss/2368
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