“…Similarly to [16] the overall set R can be divided into three subsets: the safe subset R s , the hysteresis subset R h and the dangerous subset R d . Relative to the i th group of active constraints and a given v h , the set R can be divided intoR s , R h andR d by equations (12), given on the top of next page, where e = [cos θ cos φ, sin θ cos φ, sin φ]…”