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 Fixed Points Theory on Closed 2-Dimensional Manifolds Commun. Korean Math. Soc. 2000 Vol. 15, No. 4, 675-681 Eun Sook Kang Korea University Abstract : Let $f:M\rightarrow M$ be a homotopically periodic self-map of a closed surface $M$. Except for $M=S^2$, the Nielsen number $N(f)$ and the Lefschetz number $L(f)$ of the self-map $f$ are the same. This is a generalization of Kwasik and Lee's result to 2-dimensional case. On the 2-sphere $S^2$, $N(f)=1$ and $L(f)= deg(f)+1$ for any self-map $f:S^2\rightarrow S^2$. Keywords : Lefschetz number, Nielsen number MSC numbers : Primary 55M20, Secondary 55M35 Downloads: Full-text PDF