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but when we just have a polynomial i am not shure what stality means..??

2) the hurwitz-Routh-criterion for stability, is this some kind of shortcut to see weather all the roots have negtive real parts? Or what does it prove about our polynomial?

3) The Nyquist locus curve, i know how to analyze wether the corresponding polynomial is stable, but i dont know a) how it is plotted

b) is it also telling us something about the values of the roots?

Greatful for any replies as i have my advanced mathematics exam on monday!!

siri