Helton, J. William; Klep, Igor; McCullough, Scott The tracial Hahn-Banach theorem, polar duals, matrix convex sets, and projections of free spectrahedra. (English) Zbl 1457.14123 J. Eur. Math. Soc. (JEMS) 19, No. 6, 1845-1897 (2017). Reviewer: S. S. Kutateladze (Novosibirsk) MSC: 14P10 47L25 90C22 46B25 81P47 15A22 15B48 PDFBibTeX XMLCite \textit{J. W. Helton} et al., J. Eur. Math. Soc. (JEMS) 19, No. 6, 1845--1897 (2017; Zbl 1457.14123) Full Text: DOI arXiv
Helton, J. William; Klep, Igor; McCullough, Scott Matrix convex hulls of free semialgebraic sets. (English) Zbl 1361.46056 Trans. Am. Math. Soc. 368, No. 5, 3105-3139 (2016). Reviewer: Tobias Kaiser (Passau) MSC: 46L89 46L07 14P10 13J30 PDFBibTeX XMLCite \textit{J. W. Helton} et al., Trans. Am. Math. Soc. 368, No. 5, 3105--3139 (2016; Zbl 1361.46056) Full Text: DOI arXiv