In this paper, we discuss delayed periodic dynamical systems, compare
capability of criteria of global exponential stability in terms of various
Lp (1≤p<∞) norms. A general approach to investigate global
exponential stability in terms of various Lp (1≤p<∞) norms is
given. Sufficient conditions ensuring global exponential stability are given,
too. Comparisons of various stability criteria are given. More importantly, it
is pointed out that sufficient conditions in terms of L1 norm are enough
and easy to implement in practice