Notions of interest
Fixed-time and finite-time control and estimation

The characterizations of the conventional global asymptotic stability property of the equilibrium at zero (see, for example,  ) imply that

• to any compact neighborhood of the origin, the maximal time of settling in it is infinite for initial conditions belonging to the complement of the neighborhood;

• from any compact neighborhood of the origin, the maximal time of convergence to the equilibrium is infinite;

we will return...