Rank integrity is XP in the rank parameter k yet W[1]-hard, and is equivalent up to a factor of two to ancilla integrity of graph states for clustering entanglement.
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A combinatorial framework for clustering graph states: Algorithms and hardness for rank-integrity
Rank integrity is XP in the rank parameter k yet W[1]-hard, and is equivalent up to a factor of two to ancilla integrity of graph states for clustering entanglement.