TY  - JOUR
AU  - J.G. Horne
TI  - SL(2) has no C1-extension to a half-space.
JO  - Semigroup forum
PY  - 1974
SP  - 286
EP  - 291
VL  - 7
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/SF_1974__7_134011/
ID  - SF_1974__7_134011
ER  -