There are 148perfect graphs with sixvertices,[3] and 148 ways of partitioning four people into subsets, ordering the subsets, and selecting a leader for each subset.[4]
Dunbar's number is a theoretical cognitive limit to the number of people with whom one can maintain stableinterpersonal relationships. Dunbar predicted a "mean group size" of 148,[5] but this is commonly rounded to 150.
^Dunbar, R. I. M. (1997). "Groups, Gossip, and the Evolution of Language". In Schmitt, Alain; Atzwanger, Klaus; Grammer, Karl; Schäfer, Katrin (eds.).New Aspects of Human Ethology. Kluwer Academic Publishers. pp. 77–89.doi:10.1007/978-0-585-34289-4_5.ISBN978-0-306-45695-4.
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