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Chvatal and Thomassen (J. Combinatorial Theory Ser. B 24 (1978) 61-75) proved that, given a 2-edge-connected graph G, the problem of deciding whether G has an orientation of diameter 2 is NP-complete. In this note we show that this problem, if restricted to planar graphs, becomes simple. We show that only two planar graphs admit a strong orientation of diameter 2: the 3-cycle and the octahedron.
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UTILITAS MATHEMATICA
ISSN: 0315-3681
Year: 2009
Volume: 79
Page: 71-80
0 . 5 8 9
JCR@2009
0 . 2 7 9
JCR@2020
JCR Journal Grade:4
CAS Journal Grade:1
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ESI Highly Cited Papers on the List: 0 Unfold All
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30 Days PV: 0
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