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'''Edge path cover''' | '''Edge path cover''' — дуговое путевое покрытие. | ||
Let <math>{\mathcal P} = \{P_{1}, \ldots, P_{k}\}</math> be a set of paths in a digraph | Let <math>{\mathcal P} = \{P_{1}, \ldots, P_{k}\}</math> be a set of [[path|paths]] in a [[digraph]] | ||
<math>D</math>. <math>{\mathcal P}</math> is an '''edge path cover''' of <math>D</math> iff <math>\{E(P_{1}), \ldots, | <math>D</math>. <math>{\mathcal P}</math> is an '''[[edge]] path cover''' of <math>D</math> iff <math>\{E(P_{1}), \ldots, | ||
E(P_{k})\}</math> is a partition of <math>E(D)</math>. | E(P_{k})\}</math> is a partition of <math>E(D)</math>. | ||
<math>pn_{e}(D) = \min\{|{\mathcal P}|: {\mathcal P}\mbox{ is an edge path cover | <math>pn_{e}(D) = \min\{|{\mathcal P}|: {\mathcal P}\mbox{ is an edge path cover of }D\}</math> | ||
of }D\}</math> | |||
is the '''edge path number''' of <math>D</math>. | is the '''[[edge path number]]''' of <math>D</math>. |