Abstract
It is proved that a quasivariety K of undirected graphs without loops is \(\mathcal{Q}\)-universal if and only if K contains some non-bipartite graph.
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Kravchenko, A.V. \(\mathcal{Q}\)-Universal Quasivarieties of Graphs. Algebra and Logic 41, 173–181 (2002). https://doi.org/10.1023/A:1016024925028
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DOI: https://doi.org/10.1023/A:1016024925028