منابع مشابه
On Panchromatic Digraphs and the Panchromatic Number
Let D = (V,A) be a simple digraph, and let π(D), the panchromatic number of D, be the maximum number of colours k such that for each colouring of its arcs ς : A → [k] a kernel by monochromatic paths N ⊂ V , as introduced in [6], exists. It is not hard to see that D has a kernel —in the sense of Von Neumann [11]— if and only if π(D) = |A|. In this note this invariant is introduced and some of it...
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ژورنال
عنوان ژورنال: Discrete Mathematics
سال: 2016
ISSN: 0012-365X
DOI: 10.1016/j.disc.2016.03.014