Splitting a contraction of a simple curve traversed $m$ times

Abstract

Suppose that $M$ is a $2$-dimensional oriented Riemannian manifold, and let $\gamma$ be a simple closed curve on $M$. Let $m\gamma$ denote the curve formed by tracing $\gamma$ $m$ times. We prove that if $m\gamma$ is contractible through curves of length less than $L$, then $\gamma$ is contractible through curves of length less than $L$. In the last section we state several open questions about controlling length and the number of self-intersections in homotopies of curves on Riemannian surfaces.

arXiv comment11 pages, 8 figures