Three-manifold
= Three-manifold
{wiki=3-manifold}
A three-manifold is a <topological manifold> locally modeled on $\mathbb R^3$, or on a half-space at its boundary.
= Three-manifold
{wiki=3-manifold}
A three-manifold is a <topological manifold> locally modeled on $\mathbb R^3$, or on a half-space at its boundary.