Stephan Gardoll

activity

20192022

collaborators

3 papers

math.CO2022

Combinatorics and preservation of conically stable polynomials

Giulia Codenotti, Stephan Gardoll, Thorsten Theobald

Given a closed, convex cone $K \subseteq R^{n}$ , a multivariate polynomial $f \in C [z]$ is called $K$ -stable if the imaginary parts of its roots are not conta…

math.AG2021

Imaginary Projections: Complex Versus Real Coefficients

Stephan Gardoll, Mahsa Sayyary Namin, Thorsten Theobald

Given a multivariate complex polynomial $p \in C [z_{1}, \dots, z_{n}]$ , the imaginary projection $I (p)$ of $p$ is defined as the projection of the variety $\mathcal{V…

math.AG2019

Conic stability of polynomials and positive maps

Papri Dey, Stephan Gardoll, Thorsten Theobald

Given a proper cone $K \subseteq R^{n}$ , a multivariate polynomial $f \in C [z] = C [z_{1}, \dots, z_{n}]$ is called $K$ -stable if it does not have a root whose…