Given the following Lyapunov function $$ V(x_1,x_2) = (x^2_1+x^2_2-1)^2 $$ Its time derivative is $$ \dot{V}(x_1,x_2) = -(x^2_1+x^2_2) $$ Why the origin is unstable?
2026-03-25 23:39:36.1774481976
Why this system is unstable in the sense of Lyapunov?
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