Robust SPR synthesis for low-order polynomial segments and interval polynomials

@inproceedings{Wang2001RobustSS,
  title={Robust SPR synthesis for low-order polynomial segments and interval polynomials},
  author={Long Wang and Wensheng Yu},
  year={2001}
}
We prove that, for low-order (n ≤ 4) stable polynomial segments or interval polynomials, there always exists a fixed polynomial such that their ratio is SPR-invariant, thereby providing a rigorous proof of Anderson’s claim on SPR synthesis for the fourth-order stable interval polynomials. Moreover, the relationship between SPR synthesis for low-order polynomial segments and SPR synthesis for low-order interval polynomials is also discussed. 

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