
02369993
j
2006f.03956
Smith, Amy M.
Basins of roots and periodicity in Newton's method for cubic polynomials.
Undergrad. Math J. 1, No. 2, 32 p. (2000).
2000
RoseHulman Institute of Technology, Department of Mathematics, Terre Haute, IN
EN
N40
I90
cubic polynomials
fixed points
Julia sets
attracting periodic cycles
bifurcation
Newton's method is a useful tool for finding roots of functions when analytical methods fail. The goal of our research was to understand the dynamics of Newton's method on cubic polynomials with real coefficients. Usually iterations will converge quickly to the root. However, there are more interesting things that can happen. When we allow initial values to be chosen from the complex plane, we find that the points that converge are bounded by fractals. For some polynomials we found interesting phenomena including chaos and attracting periodic cycles. We classified which polynomials could have attracting periodic cycles. (Author's abstract)