MTH 442 Introduction to Difference Equations – Spring 2012

Instructor: Orlando Merino, 101C Lippitt Hall, 8744442, merino@math.uri.edu

Time/place: MWF 10:00 a.m. Lippitt Hall 201

Text: There is no official text. Rather I will supply the necessary material through SAKAI. A good reference is: Discrete Dynamical Systems and Difference Equations with Mathematica, by M. Kulenovic and O. Merino, Chapman & Hall/CRC, 2002, ISBN 1-58488-287-5

Grading: Two Exams (20% ea.), Homework (20%), CAS Projects (20 %), Final Presentation and Project (20%).

About the Course: This course is an introduction to the basic concepts and techniques of
difference equations for advanced undergraduates and beginning graduate students. Difference
equations appear in situations where the (n + 1)^{st} generation (or state) of a system depends
upon some previous generations (or states). Such equations also appear naturally as discrete
analogues of differential equations, and as numerical solutions of differential equations that
model various diverse phenomena in biology, ecology, physiology, physics, engineering,
economics, and other areas. In addition to performing mathematical analysis of difference
equations, with the aid of a Compute Algebra System (Mathematica) you will experiment with difference equations,
and discover that such equations possess fascinating properties with a great amount of
structure. Some of these computer observations may be cast as theorems that you discover and
prove!

Topics: Introduction to Difference Equations, First order DEs, linear equations with constant coefficients, variable coefficients, stability in both hyperbolic and nonhyperbolic cases, bifurcations, symbolic dynamics and chaos, linear theory for two dimensional systems of difference equations, equilibria, stability, periodic solutions, period-doubling bifurcation, Lyapunov numbers, box dimension, stable and unstable manifolds, area preserving maps, systems with order higher than 2, numerical issues in difference equations.

Web sites and links:

M. Kulenovic's DE website: www.math.uri.edu/~kulenm/diffeqaturi/dehomepage.html

The Dynamical Systems and Techn. Project at Boston University: math.bu.edu/DYSYS/

Discrete Dynamical Syst. and Nonlinear Difference Eqs website: www.discretedynamics.net/

Dynamical Systems at Scholarpedia: www.scholarpedia.org/article/Dynamical_systems