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Max Independent Set Remains NP-hard when Excluding a Planar Induced Minor

Édouard Bonnet, Yeonsu Chang

cs.CCarXiv:2609.11285

Abstract

We show that there is a fixed planar graph H, namely the 5 × 5 grid, such that Max Independent Set remains NP-hard in H-induced-minor-free graphs. This refutes the Dallard--Milanič--Štorgel conjecture and a weakening of it by Gartland and Lokshtanov, and by Korhonen.

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