Solid Klein bottle
In mathematics, a solid Klein bottle is a three-dimensional topological space whose boundary is the Klein bottle.
It is homeomorphic to the quotient space obtained by gluing the top disk of a cylinder to the bottom disk by a reflection across a diameter of the disk.
of this space, and any regular neighbourhood of it has again boundary as a Klein bottle, so Mö x I is an onion of Klein bottles
Alternatively, one can visualize the solid Klein bottle as the trivial product, of the möbius strip and an interval. In this model one can see that
the core central curve at 1/2 has a regular neighborhood which is again a trivial cartesian product: and whose boundary is a Klein bottle.
