The invariant epsilon is a Heegaard Floer theoretic invariant defined in Hom [1]. epsilon(K) takes values in {-1, 0, 1} and is associated to the knot Floer complex of a knot. It is a concordance invariant. Values of epsilon in the database were computed using a program written by Zoltan Szabo, available at [3].


[1] Hom, J. Bordered Heegaard Floer homology and the tau-invariant of cable knots. J. Topol. 7 (2014), no. 2, 287-326. 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