“…In this case we say z shadows or ε-shadows the sequence x i ∞ i=0 . Shadowing has both numerical and theoretical importance and has been studied extensively in a variety of settings; in the context of Axiom A diffeomorphisms [9], in numerical analysis [14,15,37], as an important factor in stability theory [40,43,47], in understanding the structure of ω-limit sets and Julia sets [5,6,7,10,33], and as a property in and of itself [16,24,26,31,35,38,40,44]. A variety of variants of shadowing have also been studied including, for example, ergodic, thick and Ramsey shadowing [11,12,19,21,36], limit, or asymptotic, shadowing [4,27,41], s-limit shadowing [4,27,31], orbital shadowing [23,34,39,41], and inverse shadowing [15,25,30].…”