Abstract
A decomposition theory for submodular functions is described. Any such function is shown to have a unique decomposition consisting of indecomposable functions and certain highly decomposable functions, and the latter are completely characterized. Applications include decompositions of hypergraphs based on edge and vertex connectivity, the decomposition of matroids based on three-connectivity, the Gomory—Hu decomposition of flow networks, and Fujishige’s decomposition of symmetric submodular functions. Efficient decomposition algorithms are also discussed.
Similar content being viewed by others
References
R. E. Bixby andW. H. Cunningham, Matroids, graphs, and 3-connectivity,in: Bondy and Murty (eds.)Graph Theory and Related Topics, Academic Press, New York (1979), 91–103.
R. E. Bixby, W. H. Cunningham andD. M. Topkis. The poset of a polymatroid vertex, extreme point,Report No. 82250—OR, Universität Bonn, 1982.
W. H. Cunningham, Decomposition of directed graphs,SIAM J. Algebraic and Discrete Methods 3 (1982), 214–228.
W. H. Cunningham, Testing membership in matroid polyhedra,Report No. 81207—OR, Universität Bonn, 1981, to appear inJ. Combinatorial Th. Ser B.
W. H. Cunningham andJ. Edmonds, A combinatorial decomposition theory,Canad. J. Math. 32 (1980), 734–765.
W. H. Cunningham andJ. Edmonds, Decomposition of linear systems,in preparation.
J. Edmonds, Submodular functions, matroids, and certain polyhedra,in: R. K. Guy et al. (eds.)Combinatorial Structures, Gordon and Breach, New York (1970), 69–87.
S. Fujishige, Canonical decompositions of symmetric submodular systems,in: Saito and Nishizeki (eds.)Graph Theory and Algorithms, Springer Verlag Lecture Notes in C. S.108 (1981), 53–64, also Discr. Applied Math.5 (1983), 175–190.
R. E. Gomory andT. C. Hu, Multi-terminal network flows, SIAM J. Appl. Math.9 (1961), 551–570.
M. Grötschel, A. Schrijver andL. Lovász, The ellipsoid method and its consequences in combinatorial optimization,Combinatorica 1 (1981), 169–197.
L. Lovász,private communication, 1982.
J. M. Tan.Matroid 3-Connectivity, Thesis, Carleton University, 1981.
W. T. Tutte,Connectivity in Graphs, University of Toronto Press, 1966.
W. T. Tutte, Connectivity in matroids,Canad. J. Math. 18 (1966), 1301–1324.
L. A. Wolsey,private communication, 1981.
Author information
Authors and Affiliations
Additional information
Supported by Songerforschungsbereich 21 DFG, Institut für Operations Research Universität Bonn and by an N.S.E.R.C. of Canada operating grant.
Rights and permissions
About this article
Cite this article
Cunningham, W.H. Decomposition of submodular functions. Combinatorica 3, 53–68 (1983). https://doi.org/10.1007/BF02579341
Received:
Revised:
Issue Date:
DOI: https://doi.org/10.1007/BF02579341