Flat Riemannian manifold
= Flat Riemannian manifold
{wiki=Flat_manifold}
A Riemannian manifold is flat when every sectional curvature is zero. A complete simply connected flat $n$-manifold is isometric to Euclidean space $\mathbb R^n$.
= Flat Riemannian manifold
{wiki=Flat_manifold}
A Riemannian manifold is flat when every sectional curvature is zero. A complete simply connected flat $n$-manifold is isometric to Euclidean space $\mathbb R^n$.