We show that if K is a knot in S3 and Σ is a bridge sphere for K with high distance and 2n punctures, the number of perturbations of K required to interchange the two balls bounded by Σ via an isotopy is n. We also construct a knot with two different bridge spheres with 2n and 2n − 1 bridges respectively for which any common perturbation has at least 3n − 4 bridges. We generalize both of these results to bridge surfaces for knots in any 3–manifold.
Johnson, Jesse  1 ; Tomova, Maggy  2
@article{10_2140_agt_2011_11_1987,
author = {Johnson, Jesse and Tomova, Maggy},
title = {Flipping bridge surfaces and bounds on the stable bridge number},
journal = {Algebraic and Geometric Topology},
pages = {1987--2005},
year = {2011},
volume = {11},
number = {4},
doi = {10.2140/agt.2011.11.1987},
url = {http://geodesic.mathdoc.fr/articles/10.2140/agt.2011.11.1987/}
}
TY - JOUR AU - Johnson, Jesse AU - Tomova, Maggy TI - Flipping bridge surfaces and bounds on the stable bridge number JO - Algebraic and Geometric Topology PY - 2011 SP - 1987 EP - 2005 VL - 11 IS - 4 UR - http://geodesic.mathdoc.fr/articles/10.2140/agt.2011.11.1987/ DO - 10.2140/agt.2011.11.1987 ID - 10_2140_agt_2011_11_1987 ER -
%0 Journal Article %A Johnson, Jesse %A Tomova, Maggy %T Flipping bridge surfaces and bounds on the stable bridge number %J Algebraic and Geometric Topology %D 2011 %P 1987-2005 %V 11 %N 4 %U http://geodesic.mathdoc.fr/articles/10.2140/agt.2011.11.1987/ %R 10.2140/agt.2011.11.1987 %F 10_2140_agt_2011_11_1987
Johnson, Jesse; Tomova, Maggy. Flipping bridge surfaces and bounds on the stable bridge number. Algebraic and Geometric Topology, Tome 11 (2011) no. 4, pp. 1987-2005. doi: 10.2140/agt.2011.11.1987
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