Abstract
We study robustness of π-stability of linear difference equations under multiperturbation and affine perturbation of coefficient matrices via the concept of π-stability radius. Some explicit formulae are derived for these π-stability radii. The obtained results include the corresponding ones established earlier in Hinrichsen and Son and Ngoc and Son as particular cases.
ACKNOWLEDGMENT
The authors are supported by the Japan Society for Promotion of Science (JSPS), ID no. P 05049.