FH Lutz, T Sulanke, E Swartz - arXiv preprint arXiv:0805.1144, 2008 - arxiv.org
In 1970, Walkup completely described the set of $ f $-vectors for the four 3-manifolds $ S^
3$, $ S^ 2 twist S^ 1$, $ S^ 2\times S^ 1$, and $ RP^ 3$. We improve one of Walkup's main …