15 citations · 17 across the 5 of their papers we have counts for
5 papers
A Note on the Convex Hull of Finitely Many Projections of Spectrahedra
Tim Netzer, Rainer Sinn
A spectrahedron is a set defined by a linear matrix inequality. A projection of a spectrahedron is often called a semidefinitely representable set. We show that the convex hull of…
Closures of quadratic modules
Jaka Cimpric, Murray Marshall, Tim Netzer
We consider the problem of determining the closure of a quadratic module M in a commutative R-algebra with respect to the finest locally convex topology. This is of interest in dec…
Representation and Approximation of Positivity Preservers
Tim Netzer
We consider a closed set S in R^n and a linear operator Φon the polynomial algebra R[X_1,...,X_n] that preserves nonnegative polynomials, in the following sense: if f\geq 0 on S, t…
On the Real Multidimensional Rational K-Moment Problem
Jaka Cimpric, Murray Marshall, Tim Netzer
We present a solution to the real multidimensional rational K-moment problem, where K is defined by finitely many polynomial inequalities. More precisely, let S be a finite set of…
A note on the representation of positive polynomials with structured sparsity
David Grimm, Tim Netzer, Markus Schweighofer
We consider real polynomials in finitely many variables. Let the variables consist of finitely many blocks that are allowed to overlap in a certain way. Let the solution set of a f…