15 citations · 17 across the 5 of their papers we have counts for
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math.OC2009★ 15 cited
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…
math.AG2009★ 2 cited
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…
math.FA2009
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…