Systems & Control Letters vol:55 issue:9 pages:711-718
Based on an inversion of the Routh table construction, a unimodular characterization of all Hurwitz polynomials is obtained. In parameter space, the Hurwitz polynomials of degree n correspond to the positive 2(n)-tant. The method is then used to construct classes of stable continuous-time delay-difference equations and delay differential equations of neutral type, by a suitable limiting process. (C) 2006 Elsevier B.V. All rights reserved.