On moves between branched coverings of S^3: The case of four sheets
Abstract
Description
A combinatorial presentation of closed orientable 3-manifolds as bi-tricolored links is given together with two versions of a calculus via moves to manipulate bi-tricolored links without changing the represented manifold. That is, we provide a finite set of moves sufficient to relate any two manifestations of the same 3-manifold as a simple 4-sheeted branched covering of S^3.
63 pages, lots of pstrics and some xypic pictures, based on the author's PhD thesis at GC of CUNY
63 pages, lots of pstrics and some xypic pictures, based on the author's PhD thesis at GC of CUNY