Uniqueness of Walkup's 9-vertex 3-dimensional Klein bottle 

 - Bangalore:  Department of Mathematics, Indian Institute of Science:  2006 
 - Via a computer search, Altshuler and Steinberg found that there are 1296 + 1 combinatorial 3-manifolds on nine vertices, of which only one is non-sphere. This exceptional 3-manifold K3 9 triangulates the twisted S 2 -bundle over S 1 . It was first constru 
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