It is proved that the Weisfeiler-Leman dimension of the class of permutation graphs is at most 18. Previously it was only known that this dimension is finite (Gru{\ss}ien, 2017).

翻译：证明了置换图类的Weisfeiler-Leman维数至多为18。此前仅知其维数有限（Gru{\ss}ien, 2017）。