Pub Date : 2022-01-01Epub Date: 2021-07-07DOI: 10.1007/s11083-021-09571-6
Ádám Kunos, Miklós Maróti, László Zádori
The critical relations are the building blocks of the relational clone of a relational structure with respect to the relational operations intersection and direct product. In this paper we describe the critical relations of crowns. As a consequence, we obtain that the subpower membership problem for any crown is polynomial-time solvable.
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