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Published online by Cambridge University Press: 20 November 2018
We show that any Lipschitz projection-valued function   $p$  on a connected closed Riemannian manifold can be approximated uniformly by smooth projection-valued functions
 $p$  on a connected closed Riemannian manifold can be approximated uniformly by smooth projection-valued functions   $q$  with Lipschitz constant close to that of
 $q$  with Lipschitz constant close to that of   $p$ . This answers a question of Rieffel.
 $p$ . This answers a question of Rieffel.