Abstract
This note extends a result of Frank, Jordán, and Szigeti [3] on parity constrained orientations with connectivity requirements. Given a hypergraph H, a non-negative intersecting supermodular set function p, and a preferred in-degree parity for every node, a formula is given on the minimum number of nodes with wrong in-degree parity in an orientation of H covering p.
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References
C. Berge: Sur le couplage maximum d’un graphe, C. R. Acad. Sci. Paris 247 (1958), 258–259.
A. Frank: On the orientation of graphs, J. Combin. Theory B28 (1980), 251–261.
A. Frank, T. Jordán and Z. Szigeti: An orientation theorem with parity conditions, Discrete Applied Mathematics115 (2001), 37–45.
A. Frank, T. Király and Z. Király: On the orientation of graphs and hypergraphs, Discrete Applied Mathematics131(2) (2003), 385–400.
A. Frank, A. Sebő and É. Tardos: Covering directed and odd cuts, Mathematical Programming Study22 (1984), 99–112.
M. Makai: Parity problems of combinatorial polymatroids, PhD thesis, Eötvös University, Budapest, (2007).
M. Makai and J. Szabó: The parity problem of polymatroids without double circuits, EGRES Technical ReportTR-2006-08, www.cs.elte.hu/egres.
L. Nebeský: A new characterization of the maximum genus of a graph, Czechoslovak Math. J. 31(106) (1981), 604–613.
Gy. Pap: A constructive approach to matching and its generalizations, PhD thesis, Eötvös University, Budapest, (2006).
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Research is supported by OTKA grants K60802, TS049788 and by European MCRTN Adonet, Contract Grant No. 504438.