The invariant nu is a Heegaard Floer theoretic invariant defined by Ozsvath-Szabo [1]. It is closely related to nu^+ and nu^-. It is a concordance invariant which takes integer values. Values of nu in the database were computed using a program written by Zoltan Szabo, available at: [3].


[1] Ozsvath, P. and Szabo, Z. Knot Floer homology and rational surgeries, Algebraic & Geometric Topology. 11 (2011), no. 1, 1-68. Arxiv.

[2] Hom, J. A survey on Heegaard Floer homology and concordance, Journal of Knot Theory and Its Ramifications. Vol. 26, No. 02, 1740015 (2017). Arxiv

[3] Szabo, Z. Knot Floer Homology Calculator Knot Floer Homology Calculator