Andrés Angel and Jerson Borja – GJM, volume 1, issue 1 (2016), 1–8.
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We review the topological approach to evasiveness in , study the sizes of automorphism groups of graphs, and use this to estimate the Euler characteristic of the simplicial complex associated to a nontrivial graph property \mathcal P on 6 vertices. The condition of being nonevasive implies that the Euler characteristic of these simplicial complexes is 1, and our estimate of \chi (\mathcal P) forces \mathcal P to contain some classes of special graphs. The use of Oliver groups (as in ) is essential to deal with the different cases that appear.
Received: September 2015
Published online: June 2016
Andrés Angel, Jerson BorjaDepartamento de Matemáticas
Cr 1 No 18a-12