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Bordism groups of special generic mappings

Authors:	Rustam Sadykov

Institution:	Department of Mathematics, University of Florida, Gainesville, Florida 32611

Abstract:	The Pontrjagin-Thom construction expresses a relation between the oriented bordism groups of framed immersions $M^m\looparrowright \mathbb{R} ^n, m<n$ , and the stable homotopy groups of spheres. We apply the Pontrjagin-Thom construction to the oriented bordism groups $\mathcal M_{m,n}$ of mappings $M^m\to \mathbb{R} ^n, m>n$ , with mildest singularities. Recently, O. Saeki showed that for $m\ge 6$ , the group $\mathcal M_{m,1}$ is isomorphic to the group of smooth structures on the sphere of dimension . Generalizing, we prove that $\mathcal M_{m,n}$ is isomorphic to the -th stable homotopy group $\pi^{st}_n( \mathrm{BSDiff}_r,\mathrm{BSO}_{r+1})$ , , where $\mathrm{SDiff}_r$ is the group of oriented auto-diffeomorphisms of the sphere $S^{r}$ and $\mathrm{SO}_{r+1}$ is the group of rotations of .

Keywords:	Pontrjagin-Thom construction special generic mappings bordisms

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