Circle bundle
= Circle bundle
{wiki}
A circle bundle is a <fiber bundle> with fiber $S^1$. Oriented circle bundles over a paracompact base are classified by their <Euler class> in $H^2(B;\mathbb Z)$.
= Circle bundle
{wiki}
A circle bundle is a <fiber bundle> with fiber $S^1$. Oriented circle bundles over a paracompact base are classified by their <Euler class> in $H^2(B;\mathbb Z)$.