van der Laan, Gerard; Talman, Dolf; Yang, Zaifu - 2007
Tucker's well-known combinatorial lemma states that for any given symmetric triangulation of the n-dimensional unit … cube and for any integer labeling that assigns to each vertex of the triangulation a label from the set {1,2,...n,-1 …,-2,....-n} with the property that antipodal vertices on the boundary of the cube are assigned opposite labels, the triangulation …