Cut-Set Bedingung ∑i∈S∑j∉Sxij≥1,S⊂N,1≤∣S∣≤n−1\sum_{i \in S} \sum_{j \notin S} x_{i j} \geq 1, \quad S \subset N, 1 \leq|S| \leq n-1i∈S∑j∈/S∑xij≥1,S⊂N,1≤∣S∣≤n−1