Title of article :
Bridge index for theta curves in the 3-sphere
Author/Authors :
Goda، نويسنده , , Hiroshi، نويسنده ,
Issue Information :
دوماهنامه با شماره پیاپی سال 1997
Abstract :
We define an invariant ‘bridge index’ for theta curves which are spatial graphs in the 3-sphere. This invariant is a generalization of bridge index for links defined by Schubert. Then we investigate the relationships to other invariants and prove that 2-bridge theta curves are prime.
Keywords :
Theta curve , Bridge presentation , Yamada polynomial , Invariant , Bridge index , Thin position
Journal title :
Topology and its Applications
Journal title :
Topology and its Applications
