NOS_public issues https://gitlab.syscop.de/teaching/NOS_public/-/issues 2017-08-03T14:37:48Z https://gitlab.syscop.de/teaching/NOS_public/-/issues/2 Formula (2) in Exercise 7.1 incorrect 2017-08-03T14:37:48Z Mikhail Katliar Formula (2) in Exercise 7.1 incorrect In the formula, the sum goes from 1 to |C| on j and from 1 to j-1 on i. The expression does not depend on C, only on |C|, which is obviously wrong. It should be a sum over elements from C instead: latex \sum_{j \in C} \sum_{i \in C, i < j} x_{ij} \leq |C|-1  I would also emphasize that this should hold for *all* C satisfying the conditions: latex \forall C \subset V : 3 \leq |C| \leq n-1  In the formula, the sum goes from 1 to |C| on j and from 1 to j-1 on i. The expression does not depend on C, only on |C|, which is obviously wrong. It should be a sum over elements from C instead: latex \sum_{j \in C} \sum_{i \in C, i < j} x_{ij} \leq |C|-1  I would also emphasize that this should hold for *all* C satisfying the conditions: latex \forall C \subset V : 3 \leq |C| \leq n-1