Mathematics – Geometric Topology
Scientific paper
1999-10-19
Geom. Topol. 4(2000) 243-275
Mathematics
Geometric Topology
Published in Geometry and Topology at http://www.maths.warwick.ac.uk/gt/GTVol4/paper8.abs.html
Scientific paper
It is a consequence of theorems of Gordon-Reid [Tangle decompositions of tunnel number one knots and links, J. Knot Theory and its Ramifications, 4 (1995) 389-409] and Thompson [Thin position and bridge number for knots in the 3-sphere, Topology, 36 (1997) 505-507] that a tunnel number one knot, if put in thin position, will also be in bridge position. We show that in such a thin presentation, the tunnel can be made level so that it lies in a level sphere. This settles a question raised by Morimoto [A note on unknotting tunnels for 2-bridge knots, Bulletin of Faculty of Engineering Takushoku University, 3 (1992) 219-225], who showed that the (now known) classification of unknotting tunnels for 2-bridge knots would follow quickly if it were known that any unknotting tunnel can be made level.
Goda Hiroshi
Scharlemann Martin
Thompson Abigail
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