Glossary
Fixed-time and finite-time control and estimation

AS; asymptotic stability

A basic kind of stability of the equilibrium at the origin for a dynamical systems, when all trajectories are bounded and approaching zero

FTS; finite-time stability

A variant of asymptotic stability, when all trajectories reach zero in a finite time dependent on initial conditions

FxTS (fixed-time stability)

A kind of finite-time stability, then the upper bound on the settling time is independent in initial conditions

nFxTS (nearly fixed-time stability)

A kind of asymptotic stability, then any neighbourhood of the origin can be reached in a time independent in initial conditions

LF; Lyapunov function

The Lyapunov function method is the main approach for efficient analysis of different kinds of stability

ILF; implicit Lyapunov...