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math.GT2000
P^2-reducing and toroidal Dehn fillings
Gyo Taek Jin, Sangyop Lee, Seungsang Oh +1
We study the situation where we have two exceptional Dehn fillings on a given hyperbolic 3-manifold. We consider two cases that one filling creates a projective plane, and the othe…
math.GT2000
Superbridge index of composite knots
Gyo Taek Jin
An upper bound of the superbridge index of the connected sum of two knots is given in terms of the braid index of the summands. Using this upper bound and minimal polygonal present…