are locally accessible about if the accessibility distribution spans space, when equals the rank of and R is given by:Isidori, Alberto (1989). Nonlinear Control Systems, p. 92–3. Springer-Verlag, London. .
are locally accessible a.bout if the accessibility distr.ibution spans space, when equals the rank of and R is given by:Isidori, A!lberto (1989). Nonlinear Contr:ol Systems, p. 9:2–3. Springer-Verlag, London. .