A quadratic bound on the number of boundary slopes of essential surfaces with bounded genus

Tao Li, Ruifeng Qiu, Shicheng Wang

Published 2009-05-10, updated 2009-06-12Version 2

Let $M$ be an orientable 3-manifold with $\partial M$ a single torus. We show that the number of boundary slopes of immersed essential surfaces with genus at most $g$ is bounded by a quadratic function of $g$. In the hyperbolic case, this was proved earlier by Hass, Rubinstein and Wang.