The purpose of this paper is to introduce a harmonic functional calculus in order to generalize some extended versions of theorems of von Neumann, Heinz and Ky Fan.
@article{urn:eudml:doc:41318, title = {Harmonic functions operating in Hermitian Banach algebras.}, journal = {Publicacions Matem\`atiques}, volume = {41}, year = {1997}, pages = {403-409}, mrnumber = {MR1485491}, zbl = {0992.46039}, language = {en}, url = {http://dml.mathdoc.fr/item/urn:eudml:doc:41318} }
El Kinani, Abdellah. Harmonic functions operating in Hermitian Banach algebras.. Publicacions Matemàtiques, Tome 41 (1997) pp. 403-409. http://gdmltest.u-ga.fr/item/urn:eudml:doc:41318/