Speaker: 杨静副教授，广西民族大学

Inviter: 李伟

Title: Parametric “Non-nested” Discriminants for Multiplicities of Univariate Polynomials

Language: Chinese

Time & Venue: 2024.12.06 15:00-16:00 思源楼 515

Abstract: We consider the problem of complex root classification, i.e., finding the conditions on the coefficients of a univariate polynomial for all possible multiplicity structures on its complex roots. It is well known that such conditions can be written as conjunctions of several polynomial equations and one inequation in the coefficients. Those polynomials in the coefficients are called discriminants for multiplicities. It is also known that discriminants can be obtained by using repeated parametric gcd’s. The resulting discriminants are usually nested determinants, that is, determinants of matrices whose entries are determinants, and so on. In this talk, we give a new type of discriminants which are not based on repeated gcd’s. The new discriminants are simpler in the sense that they are non-nested determinants and have smaller maximum degrees.