TY - JOUR JF - IJMSI JO - IJMSI VL - 5 IS - 1 PY - 2010 Y1 - 2010/5/01 TI - C*-Algebra numerical range of quadratic elements TT - N2 - 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. SP - 49 EP - 53 AU - Heydari, M. T. AD - KW - C*-algebra KW - Numerical range KW - Quadratic element KW - Faithful representation. UR - http://ijmsi.ir/article-1-111-en.html DO - 10.7508/ijmsi.2010.01.006 ER -