Abstract:We explore what could make recognition of particular intersection-defined classes hard. We focus mainly on unit grid intersection graphs (UGIGs), i.e., intersection graphs of unit-length axis-aligned segments and grid intersection graphs (GIGs, which are defined like UGIGs without unit-length restriction) and string graphs, intersection graphs of arc-connected curves in a plane.We show that the explored graph classes are NP-hard to recognized even when restricted on graphs with arbitrarily large girth, i.e., l… Show more
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