Title: | Fractional covers and matchings in families of weighted d-intervals |
Authors: | Aharoni, Ron Kaiser, Tomáš Zerbib, Shira |
Citation: | AHARONI, R., KAISER, T., ZERBIB, S. Fractional covers and matchings in families of weighted d-intervals. Combinatorica>, 2017, roč. 37, č. 4, s. 555-572. ISSN 0209-9683. |
Issue Date: | 2017 |
Publisher: | Springer Verlag |
Document type: | preprint preprint |
URI: | http://hdl.handle.net/11025/29281 |
ISSN: | 0209-9683 |
Keywords: | d-interval;odpovídající číslo;příčné číslo |
Keywords in different language: | d-interval;matching number;transversal number |
Abstract in different language: | A d-interval is a union of at most d disjoint closed intervals on a fixed line. Tardos [Combinatorica 15 (1995), 123-134] and the second author [Disc. Comput. Geom. 18 (1997), 195-203] used topological tools to bound the transversal number τ of a family H of d-intervals in terms of d and the matching number ν of H. We investigate the weighted and fractional versions of this problem and prove upper bounds that are tight up to constant factors. We apply both the topological method and an approach of Alon [Disc. Comput. Geom. 19 (1998), 333-334]. For the use of the latter, we prove a weighted version of Turan's theorem. We also provide a proof of the second author's upper bound that is more direct than the original proof. |
Rights: | © Springer Verlag |
Appears in Collections: | Články / Articles (KMA) Preprinty / Preprints (KMA) OBD |
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File | Size | Format | |
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1402.2064.pdf | 197,81 kB | Adobe PDF | View/Open |
Please use this identifier to cite or link to this item:
http://hdl.handle.net/11025/29281
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