Stephan Gardoll

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20192022

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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…