
arXiv: 1412.1774
We say that a graph $G$ has a perfect $H$-packing if there exists a set of vertex-disjoint copies of $H$ which cover all the vertices in $G$. The seminal Hajnal--Szemer��di theorem characterises the minimum degree that ensures a graph $G$ contains a perfect $K_r$-packing. Balogh, Kostochka and Treglown proposed a degree sequence version of the Hajnal--Szemer��di theorem which, if true, gives a strengthening of the Hajnal--Szemer��di theorem. In this paper we prove this conjecture asymptotically. Another fundamental result in the area is the Alon--Yuster theorem which gives a minimum degree condition that ensures a graph contains a perfect $H$-packing for an \emph{arbitrary} graph $H$. We give a wide-reaching generalisation of this result by answering another conjecture of Balogh, Kostochka and Treglown on the degree sequence of a graph that forces a perfect $H$-packing. We also prove a degree sequence result concerning perfect transitive tournament packings in directed graphs. The proofs blend together the regularity and absorbing methods.
22 pages, 2 figures, to appear in JCTB
05C07, 05C35, 05C70, perfect packing, Edge subsets with special properties (factorization, matching, partitioning, covering and packing, etc.), absorbing method, regularity method, FOS: Mathematics, Mathematics - Combinatorics, Combinatorics (math.CO)
05C07, 05C35, 05C70, perfect packing, Edge subsets with special properties (factorization, matching, partitioning, covering and packing, etc.), absorbing method, regularity method, FOS: Mathematics, Mathematics - Combinatorics, Combinatorics (math.CO)
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