The non-Archimedean Nirgendsnegativsemidefinitheitsstellensatz is not true
math.OA
/ Authors
/ Abstract
Klep and Schweighofer asked whether the Nirgendsnegativsemide-finitheitsstellensatz holds for a symmetric noncommutative polynomial whose evaluations at bounded self-adjoint operators on any nontrivial Hilbert space are not negative semidefinite. We provide an example to show the open problem has a negative answer.