## A sequence of tests on derived polynomials to be strictly Hurwitz polynomials is shown to be equivalent to a given (typically real) polynomial having all its zeros in an open sector, symmetric with respect to the real axis, in the left half-plane. 7'he number of tests needed is at most 1 + [(In
Polynomial Minimum Root Separation
β Scribed by George E. Collins
- Publisher
- Elsevier Science
- Year
- 2001
- Tongue
- English
- Weight
- 201 KB
- Volume
- 32
- Category
- Article
- ISSN
- 0747-7171
No coin nor oath required. For personal study only.
β¦ Synopsis
There is a well-known lower bound, due to Mignotte, for the minimum root separation of a squarefree integral polynomial, but no evidence for the sharpness of this bound. This paper provides massive computational evidence for a conjectured much larger bound, one that is approximately the square root of Mignotte's bound.
π SIMILAR VOLUMES
A criterion for root exclusion from a region composed as a union of elemental regions-discs and halfplanes-is established. Associated with each elemental region is a derived polynomial which must be by the criterion a strictly Hurwitz polynomial. The criterion is the basis for a root exclusion test,
A new procedure is proposed for interpolation and extrapolation of functions by a root of a low=degree polynomial. Three examples of the application of the procedure are presented. The rms error in representing SCF surfaces ranges from 2 cal/mole (linear HCN) to 0.23 kcal/mole (C2v MgH2 triplet).
It is proved that the chromatic polynomial of a connected graph with n vertices and m edges has a root with modulus at least (m&1)Γ(n&2); this bound is best possible for trees and 2-trees (only). It is also proved that the chromatic polynomial of a graph with few triangles that is not a forest has a