Tutte, William T.
3-flow conjecture ★★★
Author(s): Tutte
Conjecture Every 4-edge-connected graph has a nowhere-zero 3-flow.
Keywords: nowhere-zero flow
5-flow conjecture ★★★★
Author(s): Tutte
Conjecture Every bridgeless graph has a nowhere-zero 5-flow.
Keywords: cubic; nowhere-zero flow