%0 Journal Article
%A J.G. Horne
%T SL(2) has no C1-extension to a half-space.
%J Semigroup forum
%D 1974
%P 286-291
%V 7
%I mathdoc
%U http://geodesic.mathdoc.fr/item/SF_1974__7_134011/
%F SF_1974__7_134011