Knot signature functions are independent

Details Knot signature functions are independent Knot signature functions are independent

2002-08-28

arxiv.org/abs/math/0208225v3

Proc. Amer. Math. Soc. 132 (2004) 2809-2816.

Mathematics

Geometric Topology

8 pages. Revision includes applications to knot concordance

Scientific paper

To each unit complex number with positive imaginary part there is defined a Tristram-Levine knot signature function. The set of all such signature functions is linearly independent as a set of functions defined on the set of all knots. The set of averaged signature functions forms a linearly independent set of homomorophisms on the knot concordance group. However, for each unit root of an Alexander polynomial, there is a slice knot with nonvanishing signature at that root and its conjugate, and nowhere else. These results hold for knots in all odd dimension.

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