Question: Which relations in Exercise 3 are irreflexive? A relation R on the set A is irreflexive if for every a A, (a, a)

Which relations in Exercise 3 are irreflexive?
A relation R on the set A is irreflexive if for every a ∈ A, (a, a) ∉ R. That is, R is irreflexive if no element in A is related to itself.

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