Polychromatic Colorings of Plane Graphs.

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Title: Polychromatic Colorings of Plane Graphs.
Authors: Alon, Noga1 nogaa@tau.ac.il, Berke, Robert2 berker@ethz.ch, Buchin, Kevin3 buchin@cs.uu.nl, Buchin, Maike3 maike@cs.uu.nl, Csorba, Péter4 pcsorba@win.tue.nl, Shannigrahi, Saswata5 saswata@tcs.tifr.res.in, Speckmann, Bettina4 speckman@win.tue.nl, Zumstein, Philipp6 zuphilip@inf.ethz.ch
Source: Discrete & Computational Geometry. Oct2009, Vol. 42 Issue 3, p421-442. 22p. 9 Diagrams.
Subjects: Polychromy, Central processing units, Dynamic random access memory, Computer input-output equipment, Computer storage device industry, Computer systems, Computer networks
Abstract: We show that the vertices of any plane graph in which every face is incident to at least g vertices can be colored by ⌊(3 g−5)/4 ⌋ colors so that every color appears in every face. This is nearly tight, as there are plane graphs where all faces are incident to at least g vertices and that admit no vertex coloring of this type with more than ⌊(3 g+1)/4 ⌋ colors. We further show that the problem of determining whether a plane graph admits a vertex coloring by k colors in which all colors appear in every face is in ℘ for k=2 and is $\mathcal{NP}$ -complete for k=3,4. We refine this result for polychromatic 3-colorings restricted to 2-connected graphs which have face sizes from a prescribed (possibly infinite) set of integers. Thereby we find an almost complete characterization of these sets of integers (face sizes) for which the corresponding decision problem is in ℘, and for the others it is $\mathcal{NP}$ -complete. [ABSTRACT FROM AUTHOR]
Copyright of Discrete & Computational Geometry is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Polychromatic Colorings of Plane Graphs.
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  Data: <searchLink fieldCode="AR" term="%22Alon%2C+Noga%22">Alon, Noga</searchLink><relatesTo>1</relatesTo><i> nogaa@tau.ac.il</i><br /><searchLink fieldCode="AR" term="%22Berke%2C+Robert%22">Berke, Robert</searchLink><relatesTo>2</relatesTo><i> berker@ethz.ch</i><br /><searchLink fieldCode="AR" term="%22Buchin%2C+Kevin%22">Buchin, Kevin</searchLink><relatesTo>3</relatesTo><i> buchin@cs.uu.nl</i><br /><searchLink fieldCode="AR" term="%22Buchin%2C+Maike%22">Buchin, Maike</searchLink><relatesTo>3</relatesTo><i> maike@cs.uu.nl</i><br /><searchLink fieldCode="AR" term="%22Csorba%2C+Péter%22">Csorba, Péter</searchLink><relatesTo>4</relatesTo><i> pcsorba@win.tue.nl</i><br /><searchLink fieldCode="AR" term="%22Shannigrahi%2C+Saswata%22">Shannigrahi, Saswata</searchLink><relatesTo>5</relatesTo><i> saswata@tcs.tifr.res.in</i><br /><searchLink fieldCode="AR" term="%22Speckmann%2C+Bettina%22">Speckmann, Bettina</searchLink><relatesTo>4</relatesTo><i> speckman@win.tue.nl</i><br /><searchLink fieldCode="AR" term="%22Zumstein%2C+Philipp%22">Zumstein, Philipp</searchLink><relatesTo>6</relatesTo><i> zuphilip@inf.ethz.ch</i>
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  Data: <searchLink fieldCode="JN" term="%22Discrete+%26+Computational+Geometry%22">Discrete & Computational Geometry</searchLink>. Oct2009, Vol. 42 Issue 3, p421-442. 22p. 9 Diagrams.
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  Data: We show that the vertices of any plane graph in which every face is incident to at least g vertices can be colored by ⌊(3 g−5)/4 ⌋ colors so that every color appears in every face. This is nearly tight, as there are plane graphs where all faces are incident to at least g vertices and that admit no vertex coloring of this type with more than ⌊(3 g+1)/4 ⌋ colors. We further show that the problem of determining whether a plane graph admits a vertex coloring by k colors in which all colors appear in every face is in ℘ for k=2 and is $\mathcal{NP}$ -complete for k=3,4. We refine this result for polychromatic 3-colorings restricted to 2-connected graphs which have face sizes from a prescribed (possibly infinite) set of integers. Thereby we find an almost complete characterization of these sets of integers (face sizes) for which the corresponding decision problem is in ℘, and for the others it is $\mathcal{NP}$ -complete. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Discrete & Computational Geometry is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1007/s00454-009-9171-5
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        PageCount: 22
        StartPage: 421
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      – SubjectFull: Polychromy
        Type: general
      – SubjectFull: Central processing units
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      – SubjectFull: Dynamic random access memory
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      – SubjectFull: Computer input-output equipment
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      – SubjectFull: Computer storage device industry
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      – SubjectFull: Computer systems
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      – SubjectFull: Computer networks
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      – TitleFull: Polychromatic Colorings of Plane Graphs.
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              Text: Oct2009
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