TY - JOUR AU - Lawson, J.D. TI - Fields of tangent sets and Hofmann cones. JO - Semigroup forum PY - 1986-1987 VL - 35 SP - 1 EP - 28 KW - Bony-Brezis theorem; Lipschitzian vector field; tangent vectors; Lie semigroup; Lie semialgebras; Hofmann wedge UR - http://eudml.org/doc/134853 ER -