Let $M$ be a compact connected $n$-manifold without boundary. Let $\mu\in\Omega^{n-1}(M)$, show that there exists a point $p\in M$ such that $d\mu(p)=0$.
De Rham Cohomology Question
3
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differential-topology
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4You can typeset mathematics as in LaTeX on this website: enclose mathematics in `$` or `$$` as appropriate. But please consider phrasing your question *as a question*, not as an order. – 2011-08-05