Heegaard diagram (source code)

= Heegaard diagram
{c}
{title2=$(\Sigma,\boldsymbol\alpha,\boldsymbol\beta)$}

A Heegaard diagram marks the boundaries of compressing disks from the two sides of a <Heegaard surface>. Attaching <two-handles> along the two collections, and capping resulting spherical boundary components, reconstructs the <three-manifold>.