diff -r daa522adb488 -r 84bb5ab4c85c text/appendixes/famodiff.tex --- a/text/appendixes/famodiff.tex Fri Aug 05 12:27:11 2011 -0600 +++ b/text/appendixes/famodiff.tex Tue Aug 09 19:28:39 2011 -0600 @@ -231,26 +231,29 @@ \end{lemma} \begin{proof} -We will imitate the proof of Corollary 1.3 of \cite{MR0283802}. - -Let $P$ be some $k$-dimensional polyhedron and $f:P\to \Homeo(X)$. -After subdividing $P$, we may assume that there exists $g\in \Homeo(X)$ -such that $g^{-1}\circ f(P)$ is a small neighborhood of the -identity in $\Homeo(X)$. -The sense of ``small" we mean will be explained below. -It depends only on $\cU$ and some auxiliary covers. - -We may assume, inductively, that the restriction of $f$ to $\bd P$ is adapted to $\cU$. +The proof is similar to the proof of Corollary 1.3 of \cite{MR0283802}. Since $X$ is compact, we may assume without loss of generality that the cover $\cU$ is finite. Let $\cU = \{U_\alpha\}$, $1\le \alpha\le N$. -We will need some wiggle room, so for each $\alpha$ choose open sets +We will need some wiggle room, so for each $\alpha$ choose a large finite number of open sets \[ - U_\alpha = U_\alpha^0 \supset U_\alpha^1 \supset \cdots \supset U_\alpha^N + U_\alpha = U_\alpha^0 \supset U_\alpha^1 \supset U_\alpha^2 \supset \cdots \] so that for each fixed $i$ the sets $\{U_\alpha^i\}$ are an open cover of $X$, and also so that the closure $\ol{U_\alpha^i}$ is compact and $U_\alpha^{i-1} \supset \ol{U_\alpha^i}$. +\nn{say specifically how many we need?} + + +Let $P$ be some $k$-dimensional polyhedron and $f:P\to \Homeo(X)$. +After subdividing $P$, we may assume that there exists $g\in \Homeo(X)$ +such that $g^{-1}\circ f(P)$ is contained in a small neighborhood of the +identity in $\Homeo(X)$. +The sense of ``small" we mean will be explained below. +It depends only on $\cU$ and the choice of $U_\alpha^i$'s. + +We may assume, inductively, that the restriction of $f$ to $\bd P$ is adapted to $\cU$. + Theorem 5.1 of \cite{MR0283802}, applied $N$ times, allows us to choose a homotopy $h:P\times [0,N] \to \Homeo(X)$ with the following properties: