Position graphs formalize relative positions via two strict partial orders with chain and compatibility constraints, and induced subgraph isomorphism for structural patterns remains NP-complete in this class.
: Über die Klassenzahl Abelscher Zahlkörper
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Position Spaces and Graphs
Position graphs formalize relative positions via two strict partial orders with chain and compatibility constraints, and induced subgraph isomorphism for structural patterns remains NP-complete in this class.