Fig. 9
State diagrams of sequential rejuvenations with k=0, under optimal sequential attack. Each sub-figure depicts the state diagram of a system with a different number of nodes (n∈{2,3,4}). In each sub-figure, each circle represents a set of n nodes and their states: healthy (H) or intruded (I). A rejuvenation heals (
or 
) the right-upper triangle and then rotates the circle counter-clock-wise by 2π/n (i.e., by 1/n of a full circle rotation). An intrusion intrudes (
) the healthy triangle further away (in time) being healed