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Journal Articles Discrete Mathematics Year : 2009

Submodular Partition Functions

Abstract

Adapting the method introduced in Graph Minors X, we propose a new proof of the duality between the bramble number of a graph and its tree-width. Our approach is based on a new definition of submodularity on partition functions which naturally extends the usual one on set functions. The proof does not rely on Menger's theorem, and thus generalises the original one. It thus provides a dual for matroid tree-width. One can also derive all known dual notions of other classical width-parameters from it.
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Dates and versions

lirmm-00432698 , version 1 (31-08-2010)

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Omid Amini, Frédéric Mazoit, Nicolas Nisse, Stéphan Thomassé. Submodular Partition Functions. Discrete Mathematics, 2009, 309, pp.6000-6008. ⟨10.1016/j.disc.2009.04.033⟩. ⟨lirmm-00432698⟩
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