TY  - JOUR
AU  - J. William Helton
AU  - Igor Klep
AU  - Scott McCullough
TI  - The tracial Hahn–Banach theorem, polar duals, matrix convex sets, and projections of free spectrahedra
JO  - Journal of the European Mathematical Society
PY  - 2017
SP  - 1845
EP  - 1897
VL  - 19
IS  - 6
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.4171/jems/707/
DO  - 10.4171/jems/707
ID  - JEMS_2017_19_6_a5
ER  -