Influence maximization is APX-hard on DAGs under LT, exactly solvable on out-arborescences for both IC and LT, and admits FPTAS on in-arborescences under IC.
arXiv preprint arXiv:2002.11679 (2020)
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Algorithms and Complexity of Influence Maximization on Directed Acyclic Graphs
Influence maximization is APX-hard on DAGs under LT, exactly solvable on out-arborescences for both IC and LT, and admits FPTAS on in-arborescences under IC.