4 papers
Positive Moments Forever: Undecidable and Decidable Cases
Gemma De les Coves, Joshua Graf, Andreas Klingler +1
We investigate the generalized moment membership problem for matrices, a formulation equivalent to Skolem's problem for linear recurrence sequences. We show decidability for orthog…
Homotopy Methods for Convex Optimization
Andreas Klingler, Tim Netzer
Convex optimization encompasses a wide range of optimization problems that contain many efficiently solvable subclasses. Interior point methods are currently the state-of-the-art a…
Beyond Operator Systems
Gemma De les Coves, Mirte van der Eyden, Tim Netzer
Operator systems connect operator algebra, free semialgebraic geometry and quantum information theory. In this work we generalize operator systems and many of their theorems. While…
Approximate Completely Positive Semidefinite Factorizations and their Ranks
Paria Abbasi, Andreas Klingler, Tim Netzer
In this paper we show the existence of approximate completely positive semidefinite (cpsd) factorizations with a cpsd-rank bounded above (almost) independently from the cpsd-rank o…