
The Exact Solution of Trefethen's 100 digit Challenge Problem Number 7Greg Fee, CECM
Abstract: In the January 2002 edition of SIAM News, Nick Trefethen announced the "$100, 100Digit Challenge". Each problem had a solution that was a single real number. We were only asked to obtain the first 10 significant digits of the solution to each problem, for a total of 100 decimal digits. Problem number 7 was to find the [1,1] element of the inverse of an integer matrix. The exact solution is a rational number. This exact rational number was first obtained using LinBox. We show how to obtain the exact solution using Maple10 . 