AU - Heydari, M. T. TI - C*-Algebra numerical range of quadratic elements PT - JOURNAL ARTICLE TA - IJMSI JN - IJMSI VO - 5 VI - 1 IP - 1 4099 - http://ijmsi.ir/article-1-111-en.html 4100 - http://ijmsi.ir/article-1-111-en.pdf SO - IJMSI 1 ABĀ  - It is shown that the result of Tso-Wu on the elliptical shape of the numerical range of quadratic operators holds also for the C*-algebra numerical range. CP - IRAN IN - LG - eng PB - IJMSI PG - 49 PT - Research paper YR - 2010