We define a Z4-quadratic function on π2 for nonorientable 4-manifolds and show that it is a homotopy invariant. We then use it to distinguish homotopy types of certain manifolds that arose from an analysis of toral action on nonorientable 4-manifolds.
|Number of pages||11|
|Journal||Transactions of the American Mathematical Society|
|Publication status||Published - 1992 Sept|
- Fundamental group
- Homotopy equivalence
ASJC Scopus subject areas
- Applied Mathematics