On transversality with deficiency and a conjecture of sard

Carlos Biasi, Osamu Saeki

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


Let f : M → N be a Cr map between Cr manifolds (r ≥ 1) and K a Cr manifold. In this paper, by using the Sard theorem, we study the topological properties of the space of Cr maps g : K → N which satisfy a certain transversality condition with respect to f in a weak sense. As an application, by considering the case where K is a point, we obtain some new results about the topological properties of f(Rq(f)), where Rq(f) is the set of points of M where the rank of the differential of f is less than or equal to q. In particular, we show a result about the topological dimension of f(Rq(f)), which is closely related to a conjecture of Sard concerning the Hausdorff measure of f(Rq(f)).

Original languageEnglish
Pages (from-to)5111-5122
Number of pages12
JournalTransactions of the American Mathematical Society
Issue number12
Publication statusPublished - 1998
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General Mathematics
  • Applied Mathematics


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