4 problems

Let $P(s;[\mathbf a+i\mathbf b])$ be a complex interval polynomial, and let $\mathcal O$ denote its minimal containing sector. Let $\mathcal V$ denote the sector containing the ver…

Let $P(s;[\mathbf a])$ be a real interval polynomial, and let $\mathcal O$ denote its minimal containing sector. A vertex polynomial is a polynomial obtained by choosing each coeff…

A continuous-time system with switching uncertainty consists of a system whose uncertain matrix may switch among a given set of matrices. The fixed-uncertainty reduction uses the m…

Let $A_1,\ldots,A_n$ be the matrices in the construction of the fixed-uncertainty stabilizability reduction, namely … A set of matrices is switching stabilizable when a continuous-…