116 citations · 1.1k across the 72 of their papers we have counts for
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Free bianalytic maps between spectrahedra and spectraballs in a generic setting
Meric Augat, J. William Helton, Igor Klep +1
Given a tuple of matrices, the collection of those tuples of matrices (of the same size) such that $\| \sum E_j\otimes X_j\|\le…
Geometry of free loci and factorization of noncommutative polynomials
J. William Helton, Igor Klep, Jurij Volčič
The free singularity locus of a noncommutative polynomial f is defined to be the sequence of hypersurfaces. The main theorem of this article s…
Skolem-Noether algebras
Matej Brešar, Christoph Hanselka, Igor Klep +1
An algebra is called a Skolem-Noether algebra (SN algebra for short) if for every central simple algebra , every homomorphism extends to an inner automorph…
Positive trace polynomials and the universal Procesi-Schacher conjecture
Igor Klep, Špela Špenko, Jurij Volčič
Positivstellensatz is a fundamental result in real algebraic geometry providing algebraic certificates for positivity of polynomials on semialgebraic sets. In this article Positivs…