Strong coprimality and strong irreducibility of Alexander polynomials

Details Strong coprimality and strong irreducibility of Alexander polynomials Strong coprimality and strong irreducibility of Alexander polynomials

2011-05-12

arxiv.org/abs/1105.2590v1

Mathematics

Geometric Topology

16 pages, 6 figures

Scientific paper

A polynomial f(t) with rational coefficients is strongly irreducible if f(t^k) is irreducible for all positive integers k. Likewise, two polynomials f and g are strongly coprime if f(t^k) and g(t^l) are relatively prime for all positive integers k and l. We provide some sufficient conditions for strong irreducibility and prove that the Alexander polynomials of twist knots are pairwise strongly coprime and that most of them are strongly irreducible. We apply these results to describe the structure of the subgroup of the rational knot concordance group generated by the twist knots and to provide an explicit set of knots which represent linearly independent elements deep in the solvable filtration of the knot concordance group.

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