Equality of graphs up to complementation

Author:

Dammak Jamel,Lopez Gérard,Si Kaddour HamzaORCID

Abstract

AbstractWe prove the following: Let G and $$G'$$ G be two graphs on the same set V of v vertices, and let k be an integer, $$4\le k\le v-4$$ 4 k v - 4 . If for all k-element subsets K of V, the induced subgraphs $$G_{\restriction K}$$ G K and $$G'_{\restriction K}$$ G K have the same numbers of 3-homogeneous subsets, the same numbers of $$P_4$$ P 4 ’s, and the same numbers of claws or co-claws, then $$G'$$ G is equal to G or to the complement $$\overline{G}$$ G ¯ of G. We give also a similar result whenever the same numbers are modulo a prime.

Publisher

Springer Science and Business Media LLC

Subject

General Mathematics

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