LUNCHTIME MATHS

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