EFFECTIVE FINITENESS OF IRREDUCIBLE HEEGAARD SPLITTINGS OF NON-HAKEN 3-MANIFOLDS

摘要

The main result is a short effective proof of Tao Li's theorem that a closed non-Haken hyperbolic 3-manifold N has at most finitely many irreducible Heegaard splittings. Along the way we show that N has finitely many branched surfaces of pinched negative sectional curvature carrying all closed index- = 1 minimal surfaces. This effective result, together with the sequel with Daniel Ketover, solves the classification problem for Heegaard splittings of non-Haken hyperbolic 3-manifolds.