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'''Achromatic number''' | '''Achromatic number''' — ''[[ахроматическое число]].'' | ||
The '''achromatic number''' <math>\psi(G)</math> of <math>G</math> is the maximum number of sets in a | The '''achromatic number''' <math>\,\psi(G)</math> of <math>\,G</math> is the maximum number of sets in a partition of <math>\,V</math> into ''independent'' subsets <math>V_{1}, V_{2}, \ldots, | ||
partition of <math>V</math> into ''independent'' subsets <math>V_{1}, V_{2}, \ldots, | |||
V_{k}</math> such that | V_{k}</math> such that | ||
(1) each <math>V_{i}</math> is an independent set of vertices, and | (1) each <math>\,V_{i}</math> is an independent set of vertices, and | ||
(2) for <math>i \neq j</math>, there exists <math>v_{i} \in V_{i}</math> and <math>v_{j} \in | (2) for <math>i \neq j</math>, there exists <math>v_{i} \in V_{i}</math> and <math>v_{j} \in | ||
V_{j}</math> such that <math>v_{i}v_{j} \in E(G)</math>. | V_{j}</math> such that <math>v_{i}v_{j} \in E(G)</math>. |