Vertex splitting into cographs, P_t-free, chordal, and unit-interval graphs is NP-complete under all studied variants, with no 2^{o(k)} algorithms unless ETH fails.
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Hardness of Vertex Splitting: Cographs, Chordal Graphs, and Beyond
Vertex splitting into cographs, P_t-free, chordal, and unit-interval graphs is NP-complete under all studied variants, with no 2^{o(k)} algorithms unless ETH fails.