%0 Journal Article %A W. Żelazko %T A subfield of a complex Banach algebra is not necessarily topologically isomorphic to a subfield of ℂ %J Colloquium Mathematicum %D 1992 %P 135-137 %V 63 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/cm-63-1-135-137/ %R 10.4064/cm-63-1-135-137 %G en %F 10_4064_cm_63_1_135_137