Rational Dehn surgery
= Rational Dehn surgery
{title2=$p/q$}
For a null-homologous <knot>, choose a <meridian of a knot> $\mu$ and <Seifert longitude> $\lambda$. Rational surgery with relatively prime numerator $p$ and denominator $q$ fills the <knot exterior> along $p\mu+q\lambda$. A negative <continued fraction> for $p/q$ replaces this operation by integer surgery on a chain of meridians, using <slam-dunk moves>.