Homotopy invariants of nonorientable 4-manifolds

Myung Ho Kim, Sadayosh Kojima, Frank Raymond

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)71-81
Number of pages11
JournalTransactions of the American Mathematical Society
Issue number1
Publication statusPublished - 1992 Sept
Externally publishedYes


  • 4-manifold
  • Fundamental group
  • Homotopy equivalence

ASJC Scopus subject areas

  • Mathematics(all)
  • Applied Mathematics


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