Consider an ODE system \(\displaystyle\dot{{{x}}}={f{{\left({x}\right)}}}\), having a candidate Lypunov

Oxinailelpels3t14

Oxinailelpels3t14

Answered question

2022-03-26

Consider an ODE system
x˙=f(x),
having a candidate Lypunov function, which satisfies V(x)0,V(0)=0, and V˙(x)0.
How to show that Ωc={xn:V(x)} is compact?

Answer & Explanation

zalutaloj9a0f

zalutaloj9a0f

Beginner2022-03-27Added 17 answers

Explanation:
Let c>0. We have to show that Ωc is closed and bounded.
1. Since V is differentiable, V:RnR is continuous. Therefore, Ωc is closed.
2. From the definition of radial unboundedness
c>0:r>0:xRn:(||x||>rV(x)>c)
where the contrapositive of the conditional is
V(x)c||x||r
Therefore, Ωc is bounded.

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