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Neighbourhood of a vertex: различия между версиями

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'''Neighbourhood of a vertex''' --- окрестность вершины.  
'''Neighbourhood of a vertex''' --- [[окрестность вершины]].  


For each vertex <math>v</math> the set <math>N(v)</math> of vertices which are ''adjacent'' to <math>v</math>. The other name is ''' open neighbourhood'''. The '''closed neighbourhood''' is <math>N[v] = N(v) \cup \{v\}</math>.
For each vertex <math>v</math> the set <math>N(v)</math> of vertices which are ''adjacent'' to <math>v</math>. The other name is ''' open neighbourhood'''. The '''closed neighbourhood''' is <math>N[v] = N(v) \cup \{v\}</math>.