Aspire Faculty ID #18699 · Topic: UGC NET Computer Science Dec 2022 Shift II (Paper II) · Just now
UGC NET Computer Science Dec 2022 Shift II (Paper II)

Statement 1:
Given a graph $G=(V,E)$ in which each vertex $v \in V$ has an associated positive weight $w(v)$, we can use linear programming to find the lower bound on the weight of the minimum-weight vertex cover.

Statement 2:
The lower bound can be found by maximizing the following

$ \sum_{v \in V} w(v)x(v) $

subject to

$ x(u)+x(v) \ge 1 $ for each $(u,v) \in E$

$ x(v) \le 1 $ for each $v \in V$

$ x(v) \ge 0 $ for each $v \in V$

In the light of the above statements, choose the most appropriate answer from the options given below:

Solution

For minimum-weight vertex cover, we can write an integer linear programming formulation.

Its LP relaxation can be used to find a lower bound.

So, Statement 1 is correct.

But for minimum-weight vertex cover, the objective should be minimized, not maximized.

Correct objective should be:

$ \text{Minimize } \sum_{v \in V} w(v)x(v) $

Statement 2 says maximizing the objective, so Statement 2 is incorrect.

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