J. Korean Math. Soc. 2010; 47(3): 585-599
Printed May 1, 2010
https://doi.org/10.4134/JKMS.2010.47.3.585
Copyright © The Korean Mathematical Society.
Alessia Cattabriga, Michele Mulazzani, and Andrei Vesnin
University of Bologna, University of Bologna, and Sobolev Institute of Mathematics
We deal with Matveev complexity of compact orientable 3-manifolds represented via Heegaard diagrams. This lead us to the definition of modified Heegaard complexity of Heegaard diagrams and of manifolds. We define a class of manifolds which are generalizations of Dunwoody manifolds, including cyclic branched coverings of two-bridge knots and links, torus knots, some pretzel knots, and some theta-graphs. Using modified Heegaard complexity, we obtain upper bounds for their Matveev complexity, which linearly depend on the order of the covering. Moreover, using homology arguments due to Matveev and Pervova we obtain lower bounds.
Keywords: complexity of 3-manifolds, Heegaard diagrams, Dunwoody manifolds, cyclic branched coverings
MSC numbers: Primary 57M27, 57M12; Secondary 57M25
1999; 36(3): 447-458
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