These talks will be self-contained presentations of mathematical concepts
and theorems. They are intended to be accessible to all mathematics students.
Tuesday 11th May, 2004
1 pm, S14
Eigencircles of 2-by-2 matrices
Associate Professor Graham Farr
School of Computer Science and Software Engineering
Monash University
(joint work with Michael Englefield, Honorary Research Associate, School of Mathematical Sciences, Monash University)
An eigenvalue of a square matrix A is a number k such that
Ax = kx for some nonzero vector x, and the corresponding x is
called its eigenvector. Eigenvalues and eigenvectors have
applications throughout mathematics and science. We show how
to associate, to any 2-by-2 matrix A, a circle (the eigencircle)
that can be used to illustrate and prove many properties of
eigenvalues
and eigenvectors using well-known results from classical geometry.
Convenor: Matthew Ovens