Abstract
We consider a family of words in a free group of rank n which determine 3-manifolds ℳn(p,q). We prove that the fundamental groups of ℳn(p,q) are cyclically presented, and that ℳn(p,q) is the n-fold cyclic covering of the 3-sphere branched over the torus knots T(p,q) if p is odd and q≡±2( mod p). We also obtain an explicit Dunwoody parameters for the torus knots T(p,q) for odd p and q≡±2( mod p).
Keywords

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