Question

Example 1 Let A be the set of all students of a boys school. Show that the relation R
in A given by R = {(a,b): a is sister of b} is the empty relation and R' = {(a,b): the
difference between heights of a and b is less than 3 meters) is the universal relation.
Since the chalichovo echo​

Answer 1

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Example 1 Let A be the set of all students of a boys school. Show that the relation R in A given by R = {(a, b) : a is sister of b} is the empty relation and R′ = {(a, b) : the difference between heights of a and b is less than 3 meters} is the universal relation. ... Hence, R = φ, i.e. R is an empty relation.