Focusesonclassicalproblemsingraphtheory,includingthe5-flowconjectures,theedge-3-colouringconjecture,the3-flowconjectureandthecycledoublecoverconjecture.Thetexthighlightstheinterrelationshipsbetweengraphcolouring,integerflow,cyclecoversandgraphminors.Italsoconcentratesongraphtheoreticalmeth