116 citations · 1.1k across the 72 of their papers we have counts for
Showing 2018 · math.FAShow all
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math.FA2018★ 5 cited
Noncommutative polynomials describing convex sets
J. W. Helton, I. Klep, S. McCullough +1
The free closed semialgebraic set determined by a hermitian noncommutative polynomial is the closure of the connected component of containing…
math.FA2018★ 7 cited
Bianalytic free maps between spectrahedra and spectraballs
J. William Helton, Igor Klep, Scott McCullough +1
Linear matrix inequalities (LMIs) are ubiquitous in real algebraic geometry, semidefinite programming, control theory and signal processing. LMIs with (dimension free) matrix unkno…