TY - JOUR ID - acta73911 A1 - Li Chi-Kwong A1 - Poon Yiu Tung N1 - Bibliogr.: p. 695-696. ; összefoglalás angol nyelven Y1 - 2020/// TI - Numerical range, dilation, and maximal operator systems SP - 681 EP - 696 AV - restricted JF - Acta scientiarum mathematicarum KW - Matematika VL - 86 SN - 2064-8316 IS - 3-4 UR - http://acta.bibl.u-szeged.hu/73911/ N2 - An operator system is a unital self-adjoint subspace of bounded linear operators. It is maximal if every positive linear map from it to another operator system is completely positive. In this paper, characterizations of maximal operator systems in terms of the joint numerical range are presented. New families of maximal operator systems are identified. These results admit formulations in terms of numerical range inclusion and dilation of operators that unify and extend earlier results on the topic. ER -