**Strict-feedback Form**

In control theory, dynamical systems are in strict-feedback form when they can be expressed as

where

- with ,
- are scalars,
- is a scalar input to the system,
- vanish at the origin (i.e., ),
- are nonzero over the domain of interest (i.e., for ).

Here, *strict feedback* refers to the fact that the nonlinear functions and in the equation only depend on states that are *fed back* to that subsystem. That is, the system has a kind of lower triangular form.

Read more about Strict-feedback Form: Stabilization, See Also

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