On transversality with deficiency and a conjecture of Sard

Biasi, Carlos; Saeki, Osamu

doi:10.1090/S0002-9947-98-02088-1

On transversality with deficiency and a conjecture of Sard
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by Carlos Biasi and Osamu Saeki

Trans. Amer. Math. Soc. 350 (1998), 5111-5122

DOI: https://doi.org/10.1090/S0002-9947-98-02088-1

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Abstract:

Let $f : M \to N$ be a $C^{r}$ map between $C^{r}$ manifolds $(r \geq 1)$ and $K$ a $C^{r}$ manifold. In this paper, by using the Sard theorem, we study the topological properties of the space of $C^{r}$ maps $g : K \to N$ 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 $f(R_{q}(f))$, where $R_{q}(f)$ 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 $f(R_{q}(f))$, which is closely related to a conjecture of Sard concerning the Hausdorff measure of $f(R_{q}(f))$.

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