Control Systems
A system is stable for (where GM = Gain Margin and PM = Phase Margin):

 GM -ve.
 PM - ve.
 GM and PM both +ve.
 GM and PM both -ve.

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Control Systems
For a transfer function H (s) = P(s) / Q(s), where P (s) and Q (s) are polynomials in s. Then

 maximum degree of P (s) and Q (s) differ at most by one.
  degree of P (s) is independent of degree of Q (s).
 the degree of P (s) and Q (s) are same.
 the degree of P (s) is always greater than the degree of Q (s).

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