Question: Let N be the direct neighbor relation defined on the set of all people: if x and y are persons, xNy iff x and y

Let N be the "direct neighbor" relation defined on the set of all people: if x and y are persons, xNy iff x and y live directly next to each other, such as in two houses or apartments that are directly next to each other. If there is at least one unit between them, then they don't live directly next to teach other. Check all properties that this relation has

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