Operators and Matrices · Volume 13, Issue 4 Examples for the quantum Kippenhahn theorem 13-74 Pages 1091-1124 DOI 10.7153/oam-2019-13-74 Downloads Short PDF Full PDF PNG Authors Ben Lawrence Keywords free analysis non-commutative algebra linear pencil double eigenvalues Kippenhahn conjecture Subject classes 15A22 15A42 46L52 90C22