totie3442 totie3442

22-05-2023
Mathematics

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Is (S, R) a poset if S is the set of all people in the world and (a, b) ∈ R, where a and b are people, if a) a is taller than b? b) a is not taller than b? c) a = b or a is an ancestor of b? d) a and b have a common friend?

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