Let \(M\) be a smooth manifold and \(p:E\to M\) a smooth vector bundle on \(M\) (with fibers finite-dimensional \(\mathbb {R}\)-vector spaces).
- Define the notion of a smooth (Euclidean, also called Riemannian) metric on \(E\).
- Using partitions of unity, show that \(E\) admits a smooth metric.