一句话:证明单调稳定且有界 twin-width 的图类可由有界稀疏 twin-width 的图类经 transductions 得到,并推出线性 χ-有界性。
论文研究图类的模型论稳定性与结构宽度之间的联系,聚焦单调稳定(monadically stable)且 twin-width 有界的图类。作者证明,这类图类可以从某个具有有界稀疏 twin-width 的图类通过 transductions 得到。该结论推广了此前对有界线团宽(linear cliquewidth)图类和有界团宽图类得到的类似结果。作为推论,单调稳定且有界 twin-width 的图类是线性 χ-有界的。这一结果将稳定性条件与稀疏/稠密图类之间的可转导关系联系起来,为相关图类的结构刻画与着色界提供了统一框架。
We prove that every class of graphs that is monadically stable and has bounded twin-width can be transduced from some class with bounded sparse twin-width. This generalizes analogous results for classes of bounded linear cliquewidth [Nešetřil et al. 2021b] and of bounded cliquewidth [Nešetřil et al. 2021a]. It also implies that monadically stable classes of bounded twin-width are linearly χ-bounded.