Journal of Differential Geometry

0-Efficient Triangulations of 3-Manifolds

William Jaco and J. Hyam Rubinstein

Abstract

0-efficient triangulations of 3-manifolds are defined and studied. It is shown that any triangulation of a closed, orientable, irreducible 3-manifold M can be modified to a 0-efficient triangulation or M can be shown to be one of the manifolds S3,ℝP3 or L(3, 1). Similarly, any triangulation of a compact, orientable, irreducible, ∂-irreducible 3-manifold can be modified to a 0-efficient triangulation. The notion of a 0-efficient ideal triangulation is defined. It is shown if M is a compact, orientable, irreducible, ∂-irreducible 3-manifold having no essential annuli and distinct from the 3-cell, then \ring M admits an ideal triangulation; furthermore, it is shown that any ideal triangulation of such a 3-manifold can be modified to a 0-efficient ideal triangulation. A 0-efficient triangulation of a closed manifold has only one vertex or the manifold is S3 and the triangulation has precisely two vertices. 0-efficient triangulations of 3-manifolds with boundary, and distinct from the 3-cell, have all their vertices in the boundary and then just one vertex in each boundary component. As tools, we introduce the concepts of barrier surface and shrinking, as well as the notion of crushing a triangulation along a normal surface. A number of applications are given, including an algorithm to construct an irreducible decomposition of a closed, orientable 3-manifold, an algorithm to construct a maximal collection of pairwise disjoint, normal 2-spheres in a closed 3-manifold, an alternate algorithm for the 3-sphere recognition problem, results on edges of low valence in minimal triangulations of 3-manifolds, and a construction of irreducible knots in closed 3-manifolds.

Article information

Source
J. Differential Geom. Volume 65, Number 1 (2003), 61-168.

Dates
First available in Project Euclid: 22 July 2004

Permanent link to this document
http://projecteuclid.org/euclid.jdg/1090503053

Digital Object Identifier
doi:10.4310/jdg/1090503053

Mathematical Reviews number (MathSciNet)
MR2057531

Zentralblatt MATH identifier
1068.57023

Citation

Jaco, William; Rubinstein, J. Hyam. 0-Efficient Triangulations of 3-Manifolds. J. Differential Geom. 65 (2003), no. 1, 61--168. doi:10.4310/jdg/1090503053. http://projecteuclid.org/euclid.jdg/1090503053.


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