A counter example of Yashiro's theorem on pseudo-cycles of a surface knot

Abstract

We point out that the claim in Theorem 1.1 of Yashiro's paper ``Pseudo-cycles of surface-knots'' is not true, giving a counter example.

The contents of this paper was integrated into the paper "The lengths of 3-cocycles of the 7-dihedral and the octahedral quandles" (arXiv:2508.14612) as Appendix A