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Fix error in exercise
Signed-off-by: Marcello Seri <marcello.seri@gmail.com>
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7-integration.tex

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@@ -185,7 +185,8 @@ \section{Orientation on manifolds}
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\end{definition}
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\begin{exercise}
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Show that a diffeomorphism $F: M \to N$ is \emph{orientation preserving} if and only if for all $p\in M$, $dF_p : T_p M \to T_{F(p)}$ is an orientation preserving as a linear map, that is, if $\det(dF_p)>0$.
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Let $M$ be a positively oriented smooth manifold.
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Show that a diffeomorphism $F: M \to N$ is \emph{orientation preserving} if and only if for all $p\in M$, $dF_p : T_p M \to T_{F(p)} N$ is orientation preserving as a linear map, that is, if the Jacobian determinant of $F(p)$ with respect to some (and hence any) charts in the atlas is positive.
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\end{exercise}
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% \begin{theorem}

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