q-Difference equations occupy a central role in modern mathematical analysis, providing a discrete analogue of differential equations in which the usual derivative is replaced by a finite-difference ...

Functional differential equations encompass differential systems in which derivatives at any given time depend not only on the present state but also on past or distributed states, parameters or other ...

A discrete-time system is implemented as a set of difference equations. A difference equation is a recursive algebraic equation that computes the next value of a discrete output given the current and ...