Write the smallest reflexive relation on set

Question:

Write the smallest reflexive relation on set A = {1, 2, 3, 4}.

Solution:

Here,
A
 = {1, 2, 3, 4}
Also, a relation is reflexive iff every element of the set is related to itself.

So, the smallest reflexive relation on the set A is
R = {(1, 1), (2, 2), (3, 3), (4, 4)}

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