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Proof of the 1-Factorization and Hamilton Decomposition Conjectures, Paperback / softback Book

Proof of the 1-Factorization and Hamilton Decomposition Conjectures Paperback / softback

Part of the Memoirs of the American Mathematical Society series

Paperback / softback

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In this paper the authors prove the following results (via a unified approach) for all sufficiently large n: (i) [1-factorization conjecture] Suppose that n is even and D≥2⌈n/4⌉−1.

Then every D-regular graph G on n vertices has a decomposition into perfect matchings.

Equivalently, χ′(G)=D. (ii) [Hamilton decomposition conjecture] Suppose that D≥⌊n/2⌋.

Then every D-regular graph G on n vertices has a decomposition into Hamilton cycles and at most one perfect matching. (iii) [Optimal packings of Hamilton cycles] Suppose that G is a graph on n vertices with minimum degree δ≥n/2.

Then G contains at least regeven (n,δ)/2≥(n−2)/8 edge-disjoint Hamilton cycles.

Here regeven (n,δ) denotes the degree of the largest even-regular spanning subgraph one can guarantee in a graph on n vertices with minimum degree δ. (i) was first explicitly stated by Chetwynd and Hilton. (ii) and the special case δ=⌈n/2⌉of (iii) answer questions of Nash-Williams from 1970.

All of the above bounds are best possible.

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