Two relational structures are indistinguishable by k-RCR if and only if they receive identical homomorphism counts from every structure of generalised hypertreewidth ≤ k.
A Linear Upper Bound on the Weisfeiler-Leman Dimension of Graphs of Bounded Genus , booktitle =
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Homomorphism Indistinguishability Beyond Graphs: Relational Weisfeiler--Leman and Hypertree Width
Two relational structures are indistinguishable by k-RCR if and only if they receive identical homomorphism counts from every structure of generalised hypertreewidth ≤ k.