Appendix CLYAPUNOV STABILITY
We give here some basic results on stability theory for nonlinear systems. For simplicity we treat only time-invariant systems. For a more general treatment of the subject the reader is referred to [180]. We first need a few definitions from real analysis regarding continuity and differentiability of functions.
C.1 Continuity and Differentiability
Definition C.1 (Continuous function).
Let
be an open subset of
. A function
is continuous at a point
if, for all ε > 0, there exists a δ > 0 such that, if |x − x0| < δ (and
), then |f(x) − f(x0)| < ε.
An alternative characterization of continuity is that
is continuous at x = x0 if f(x) → f(x0) as x → x0.
Definition C.2 (Uniform continuity).
A function
is uniformly continuous on if for every ε > 0 there ...
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Read now
Unlock full access