Theorem on friends and strangers
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The theorem on friends and strangers is a mathematical theorem in an area of mathematics called Ramsey theory.
Theorem on friends and strangers - Wikipedia Jump to content From Wikipedia, the free encyclopedia Mathematical theorem For the friendship theorem of Paul Erdős , Alfréd Rényi , and Vera T. Sós characterizing graphs in which each two vertices have exactly one neighbor, see friendship graph . 78 of the 156 possible friends-strangers graphs with 6 nodes. The other 78 can be obtained by reversing the red and blue colours of each graph. For each graph the red/blue nodes shows a sample triplet of mutual friends/strangers. The theorem on friends and strangers is a mathematical theorem in an area of
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