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math.GT1999
How a strongly irreducible Heegaard splitting intersects a handlebody
Matt Jones, Martin Scharlemann
It has been shown elsewhere that a strongly irreducible Heegaard splitting surface Q of a compact orientable 3-manifold M can, under reasonable side conditions, intersect a ball or…
math.GT1999
The tunnel number of the sum of n knots is at least n
Martin Scharlemann, Jennifer Schultens
We prove that the tunnel number of the sum of n knots is at least n.