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Let s, t be distinct vertices of a digraph G, and let c : E(G) Z+. Let be a c-admissible s t ow of value k and suppose there is a c-admissible ow...

2. Let s, t be distinct vertices of a digraph G, and let c : E(G) → Z+.
Let φ be a c-admissible s − t flow of value k and suppose there is a
c-admissible flow with value > k. Does it follow that there is a c-
admissible flow ψ of value > k so that φ(e) ≤ ψ(e) for every edge
e?

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