%0 Journal Article %A Heydari, M. T. %T C*-Algebra numerical range of quadratic elements %J Iranian Journal of Mathematical Sciences and Informatics %V 5 %N 1 %U http://ijmsi.ir/article-1-111-en.html %R 10.7508/ijmsi.2010.01.006 %D 2010 %K C*-algebra, Numerical range, Quadratic element, Faithful representation., %X 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. %> http://ijmsi.ir/article-1-111-en.pdf %P 49-53 %& 49 %! %9 Research paper %L A-10-1-79 %+ %G eng %@ 1735-4463 %[ 2010