International Journal of Mathematics and Mathematical Sciences

International Journal of Mathematics and Mathematical Sciences / 1990 / Article

Open Access

Volume 13 |Article ID 549325 | https://doi.org/10.1155/S0161171290001132

Takis Sakkalis, "On a theorem of H. Hopf", International Journal of Mathematics and Mathematical Sciences, vol. 13, Article ID 549325, 4 pages, 1990. https://doi.org/10.1155/S0161171290001132

On a theorem of H. Hopf

Received01 Feb 1989
Revised09 Mar 1990

Abstract

A simple proof of a theorem of H. Hopf [1], via Morse theory, is given.

Copyright © 1990 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


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