Question: Problem: Almost Independent Set Instance: An undirected graph G = ( V , E ) , and an integer k . Question: Is there a

Problem: Almost Independent Set
Instance: An undirected graph G =(V,E), and an integer k.
Question: Is there a subset S V with |S| k such that each vertex
in S is adjacent to at most one other vertex in S.
Prove that Almost Independent Set is NP-hard.

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