This is maybe easy for some people. But, I wanna know. Is
$$\frac{s}{(s^2+1)(s^2+4)}$$
not bibo stable? Why not?
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1Because $f(s)=\frac{s}{(s^2+1)(s^2+4)}$ has simple poles on the unit circle, at $\pm i$. – Jack D'Aurizio Mar 01 '17 at 19:58
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1What is the definition of BIBO stability? – Norman Sep 30 '17 at 05:11