Note on a Theorem of Munkres

We prove that given a $\mathcal{C^\infty}$ Riemannian manifold with boundary, any fat triangulation of the boundary can be extended to the whole manifold. We also show that this result holds extends to $\mathcal{C}^1$ manifolds, and that in dimensions $2,3$ and 4 it also holds for $PL$ manifolds. We employ the main result to prove that given any orientable $\mathcal{C^\infty}$ Riemannian manifold with boundary admits quasimeromorphic mappings onto $\hat{\mathbb{R}^n}$. In addition some generalizations are given.

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