Group Connectivity: ${\mathbb{Z}}_4$ v. ${\mathbb{Z}}_2^2$

Radek Hušek, Lucie Mohelníková, Robert Šámal

We answer a question on group connectivity suggested by Jaeger et al. [Group connectivity of graphs -- A nonhomogeneous analogue of nowhere-zero flow properties, JCTB 1992]: we fin…