Обговорення:Сертифікат (складність обчислень)
індивідуалізація
ред.- Testing isomorphism of combinatorial and algebraic structures, by Paolo Codenotti. Chicago, Illinois, August 2011
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- 2.4.2 Weisfeiler-Lehman process
One combinatorial technique we will make use of, which can be used to start a refinement process, is to assign a unique color to one of the vertices; in this case we say that we individualize that vertex (see Figure 2.4.2).
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- 3.5.2 Individualization
Recall that to individualize a vertex in means to assign a special color, say "red", in , resulting in the structure (cf. Section 2.4.2). For each , let move to . Now we have
This recurrence thus reduces an instance of the -isomorphism to instances of -isomorphism. To individualize a set of vertices means to individualize each in succession; the cost is a factor of . By breaking the symmetry we hope to make sufficient progress to offset this factor.