Abstract
It is shown that for low-order perturbed continuous system polynomials (N<or=6), stability can be guaranteed by checking very simple conditions based on the Hermite-Biehler theorem. For N<or=5 no numerical computation of the roots is required to check stability. For N=6, one root of a third-order polynomial needs to be found, with the rest of the conditions reducing to simple algorithmic relationships. The result is illustrated by numerical examples.<<ETX>>
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