Well-covered graph: различия между версиями
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ALEXM (обсуждение | вклад) Нет описания правки |
ALEXM (обсуждение | вклад) Нет описания правки |
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Let <math>\beta</math>, respectively <math>i</math>, denote the maximum, respectively | Let <math>\beta</math>, respectively <math>i</math>, denote the maximum, respectively | ||
minimum, cardinality of a maximal ''independent set'' of <math>G</math>. A | minimum, cardinality of a maximal ''independent set'' of <math>G</math>. A | ||
graph is mathcalled ''' well-covered''' if for this graph <math>i = \beta | graph is mathcalled ''' well-covered''' if for this graph <math>i = \beta </math> | ||
and <math>\beta + \Delta = \lceil2\sqrt{n} - 1\rceil</math>. The problem of | and <math>\beta + \Delta = \lceil2\sqrt{n} - 1\rceil</math>. The problem of | ||
determining whether or not a graph is '' not'' well-covered is | determining whether or not a graph is '' not'' well-covered is | ||
''NP''-complite. | ''NP''-complite. | ||
Версия от 15:33, 3 марта 2017
Well-covered graph --- хорошо покрытый граф.
Let [math]\displaystyle{ \beta }[/math], respectively [math]\displaystyle{ i }[/math], denote the maximum, respectively minimum, cardinality of a maximal independent set of [math]\displaystyle{ G }[/math]. A graph is mathcalled well-covered if for this graph [math]\displaystyle{ i = \beta }[/math] and [math]\displaystyle{ \beta + \Delta = \lceil2\sqrt{n} - 1\rceil }[/math]. The problem of determining whether or not a graph is not well-covered is NP-complite.