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Degree Theory of Immersed Hypersurfaces

About this Title

Harold Rosenberg and Graham Smith

Publication: Memoirs of the American Mathematical Society
Publication Year: 2020; Volume 265, Number 1290
ISBNs: 978-1-4704-4185-2 (print); 978-1-4704-6148-5 (online)
DOI: https://doi.org/10.1090/memo/1290
Published electronically: April 8, 2020
Keywords: Degree theory, immersions, convexity, prescribed curvature, non-linear elliptic PDEs
MSC: Primary 58D10; Secondary 58B05, 58C40, 58J05

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Table of Contents

Chapters

  • 1. Introduction
  • 2. Degree theory
  • 3. Applications
  • A. Weakly smooth maps
  • B. Prime immersions

Abstract

We develop a degree theory for compact immersed hypersurfaces of prescribed $K$-curvature immersed in a compact, orientable Riemannian manifold, where $K$ is any elliptic curvature function. We apply this theory to count the (algebraic) number of immersed hyperspheres in various cases: where $K$ is mean curvature, extrinsic curvature and special Lagrangian curvature, and we show that in all these cases, this number is equal to $-\chi (M)$, where $\chi (M)$ is the Euler characteristic of the ambient manifold $M$.

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