Min-cut Duality
l [Edmonds]: min-cut=max tree packing
» convert to directed graph
» “source” vertex s (doesn’t matter which)
» spanning trees directed away from s
l [Gabow] “augmenting trees”
» add a tree in O*(m) time
» min-cut c (via max packing) in O*(mc)
» great if m and c are small…