Understanding 3-manifolds in the context of permutations

Details Understanding 3-manifolds in the context of permutations Understanding 3-manifolds in the context of permutations

2011-08-19

arxiv.org/abs/1108.3885v2

Mathematics

Geometric Topology

15 pages, 5 figures. Abstract refined from Aug 22 2011 submission

Scientific paper

We demonstrate how a 3-manifold, a Heegaard diagram, and a group presentation can each be interpreted as a pair of signed permutations in the symmetric group $S_d.$ We demonstrate the power of permutation data in programming and discuss an algorithm we have developed that takes the permutation data as input and determines whether the data represents a closed 3-manifold. We therefore have an invariant of groups, that is given any group presentation, we can determine if that fixed presentation presents a closed 3-manifold. (The proposed techniques begin with a pair of signed permutations and builds a finite group presentation. The finite group presentation results in a finite class of associated 3-manifolds. Notice that a negative answer only implies the fixed presentation does not result in a closed 3-manifold under this construction, but says nothing about an isomorphic form of the group presentation.)

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