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math.CO2019
Flows on signed graphs without long barbells
You Lu, Rong Luo, Michael Schubert +2
Many basic properties in Tutte's flow theory for unsigned graphs do not have their counterparts for signed graphs. However, signed graphs without long barbells in many ways behave…
math.CO2019
Flows on flow-admissible signed graphs
Matt DeVos, Jiaao Li, You Lu +3
In 1983, Bouchet proposed a conjecture that every flow-admissible signed graph admits a nowhere-zero -flow. Bouchet himself proved that such signed graphs admit nowhere-zero $21…