Keywords: Moxi00.JPG en 4 explain o 3d mflds my compu juan marqz 2009-10-31 ImageNote 1 418 425 8 8 479 523 2 this is interesant obvia it represents the cartesian product of the möbius band times an interval the black pearled central simple closed curve is the absolute deformation retract of you also can calculate that the boundary is the union of two móbius band along an annulus then this construction is an onion of Klein bottles chido-no ImageNoteEnd 1 Also in http //juanmarqz files wordpress com/2009/09/moxi00 jpg Algebraic topology 3-manifolds Topology diagrams |