Abstract
We study the ratio between the minimum size of an odd cycle vertex transversal and the maximum size of a collection of vertex-disjoint odd cycles in a planar graph. We show that this ratio is at most 10. For the corresponding edge version of this problem, Král and Voss recently proved that this ratio is at most 2; we also give a short proof of their result.
Similar content being viewed by others
References
Appel K. and Haken W. (1976). A proof of the four color theorem. Discrete Math. 16: 179–180
Caprara A. and Rizzi R. (2002). Packing triangles in bounded degree graphs. Inform. Process Lett. 84: 175–180
Dilworth R.P. (1950). A decomposition theorem for partially ordered sets. Ann. Math. 51: 161–166
Erdös P. and Pósa L. (1965). On independent circuits contained in a graph. Canad. J. Math. 17: 347–352
Fiorini, S., Hardy, N., Reed, B., Vetta, A.: Planar graph bipartization in linear time. Discr. Appl. Math. (in press)
Frank, A.: A survey on T-joins, T-cuts, and conservative weightings. In: Combinatorics, Paul Erdös is eighty, vol. 2, pp. 213–252. Keszthely, 1993, János Bolyai Mathematical Society, Budapest (1996)
Garey M.R. and Johnson D.S. (1977). The rectilinear Steiner tree problem is NP-complete. SIAM. J. Appl. Math. 32: 826–834
Goemans M.X. and Williamson D.P. (1998). Primal-dual approximation algorithms for feedback problems in planar graphs. Combinatorica 18: 37–59
Hadlock F. (1975). Finding a maximum cut of a planar graph in polynomial time. SIAM. J. Comput. 4: 221–225
Hardy, N.: Odd cycles in planar graphs. Master’s Thesis, McGill University, Montreal, Canada (June 2005)
Král D. and Voss H. (2004). Edge-disjoint odd cycles in planar graphs. J. Combin. Theory. Ser. B 90: 107–120
Lovász L. (1975). 2-matchings and 2-covers of hypergraphs. Acta. Math. Acad. Sci. Hungar. 26: 433–444
Rautenbach D. and Reed B. (2001). The Erdős-Pósa property for odd cycles in highly connected graphs. Combinatorica 21: 267–278
Reed, B.: Mangoes and blueberries. Combinatorica 19, 267–296 (1999)
Reed B., Smith K. and Vetta A. (2004). Finding odd cycle transversals. Oper. Res. Lett. 32: 299–301
Robertson N., Sanders D., Seymour P. and Thomas R. (1997). The four colour theorem. J. Combin. Theory. Ser. B 70: 2–44
Schrijver, A.: Combinatorial Optimization: Polyhedra and efficiency, vol. C. Springer, Berlin Heidelberg New York (2003)
Seymour P. (1981). On odd cuts and plane multicommodity flows. Proc. London Math Soc 42(3): 178–192
Vazirani V.V. (2001). Approximation algorithms. Springer, Berlin Heidelberg New York
Author information
Authors and Affiliations
Corresponding author
Additional information
This work was supported by FNRS, NSERC (PGS Master award, Canada Research Chair in Graph Theory, award 288334-04) and FQRNT (award 2005-NC-98649).
Rights and permissions
About this article
Cite this article
Fiorini, S., Hardy, N., Reed, B. et al. Approximate min–max relations for odd cycles in planar graphs. Math. Program. 110, 71–91 (2007). https://doi.org/10.1007/s10107-006-0063-7
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s10107-006-0063-7