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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 paths in a digraph | ||
<math>D</math>. <math>{\mathcal P}</math> is a ''' vertex path cover''' of <math>D</math> iff <math>\{V(P_{1}), \ldots, | <math>D</math>. <math>{\mathcal P}</math> is a ''' vertex path cover''' of <math>D</math> iff <math>\{V(P_{1}), \ldots, | ||
V(P_{k})\}</math> is a partition of <math>V(D)</math>. | V(P_{k})\}</math> is a partition of <math>V(D)\,</math>. | ||
<math>\textstyle pn_{v}(D) = \min\{|{\mathcal P}|: {\mathcal P}</math> is a vertex path cover | <math>\textstyle pn_{v}(D) = \min\{|{\mathcal P}|: {\mathcal P}</math> is a vertex path cover | ||
of <math>D\}</math> | of <math>D\}\,</math> | ||
is the ''' vertex path number''' of <math>D</math>. | is the ''' vertex path number''' of <math>D</math>. | ||