On $3$-flow-critical graphs

Jiaao Li, Yulai Ma, Yongtang Shi +2

A bridgeless graph $G$ is called $3$-flow-critical if it does not admit a nowhere-zero $3$-flow, but $G/e$ has for any $e\in E(G)$. Tutte's $3$-flow conjecture can be equivalently…