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Metcalfe's (revised!) law states that the value of a communications network grows at about nlogn.
I frequently give my friends the advice that they should aim to become pretty good at 2 synergistic disciplines (CS and EE for me, for example), but I have wondered in the past why I don't give them the advice to become okay at 4 or 5 synergistic disciplines instead.
It just struck me these ideas might be connected in some way, but I am having trouble figuring out exactly how.