just the surface. Notes References ; reprinted in The Scientific Papers of J. Willard Gibbs, Vol. I: Thermodynamics, Longmans, Green, & Co., 1906, pp. 33–54 ; see p. 143 ; see also review by Hans Rademacher (1922), , translated in Journal of Soviet Mathematics 33 (4): 1140–1153, 1986, External links "Convex Hull" by Eric W. Weisstein, Wolfram Demonstrations Project, 2007. Closure operators Convex analysis Computational geometry Geometry processing