On one combinatorial lemma
Tóm tắt
We study n-dimensional cubical pseudomanifolds and their cellular mappings. In particular, we consider a discrete n-cube and all of its (n − 1)-faces. Then, there exist either one or two or four faces of the cube each of which is mapped onto one face.
Tài liệu tham khảo
Yu. A. Shashkin, Proc. Steklov Inst. Math., Suppl. 2, S208 (2001).