Published online by Cambridge University Press: 24 October 2008
We shall understand the norm, h(A) of a regular matrix A = (amn) to be
The method has a norm, ‖
‖, ‖
‖ ≥ 1, given by ‖
‖ = inf h(A) where the inf is taken over all the matrix methods equivalent to
for bounded sequences (b-equivalent). These definitions are due essentially to Brudno(1) though his definition of