Journal of Combinatorial Theory Series A ( IF 1.1 ) Pub Date : 2020-03-26 , DOI: 10.1016/j.jcta.2020.105252 Marthe Bonamy , Natasha Morrison , Alex Scott
Let H be an induced subgraph of the torus . We show that when is even and divides some power of k, then for sufficiently large n the torus has a perfect vertex-packing with induced copies of H. On the other hand, disproving a conjecture of Gruslys, we show that when k is odd and not a prime power, then there exists H such that divides some power of k, but there is no n such that has a perfect vertex-packing with copies of H. We also disprove a conjecture of Gruslys, Leader and Tan by exhibiting a subgraph H of the k-dimensional hypercube , such that there is no n for which has a perfect edge-packing with copies of H.
中文翻译:
将圆环的顶点划分为同构子图
令H为圆环的诱导子图。我们表明 甚至 除以k的一些幂,然后对于足够大的n个圆环具有诱导H的完美顶点堆积。另一方面,证明格鲁斯利的一个猜想,我们证明当k为奇数而不是素数时,则存在H使得除以k的一些幂,但没有n使得具有H的完美顶点堆积。我们还通过展示k维超立方体的子图H来反驳Gruslys,Leader和Tan的猜想,使得没有Ñ为其具有与H的副本的完美边缘堆积。