We classify the genus one compact (PL) 5-manifolds and prove some results about closed 5-manifolds with free fundamental group. In particular, let $M$ be a closed connected orientable smooth $5$-manifold with free fundamental group. Then we prove that the number of distinct smooth $5$-manifolds homotopy equivalent to $M$ equals the $2$-nd Betti number (mod $2$) of $M$.
@article{118607, author = {Alberto Cavicchioli and Fulvia Spaggiari}, title = {On the topological structure of compact 5-manifolds}, journal = {Commentationes Mathematicae Universitatis Carolinae}, volume = {34}, year = {1993}, pages = {513-524}, zbl = {0784.57009}, mrnumber = {1243082}, language = {en}, url = {http://dml.mathdoc.fr/item/118607} }
Cavicchioli, Alberto; Spaggiari, Fulvia. On the topological structure of compact 5-manifolds. Commentationes Mathematicae Universitatis Carolinae, Tome 34 (1993) pp. 513-524. http://gdmltest.u-ga.fr/item/118607/
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